1. Turn on 1st switch and keep it on for a few minutes. 2. Switch off the 1st switch and turn on 2nd switch. 3. Immediately enter the room. A. If bulb is on, 2nd switch it is. B. If bulb is off and warm, then, 1st switch. C. If bulb is off and cold, then, 3rd switch.
This also works for 4 switches and 1 bulb puzzle. If you turn on 1st switch and 2nd switch to keep it on for a few minutes, then turn off the 2nd switch and turn on 3rd switch. Go into the room immediatly to touch the bulb after turning on the 3rd switch, you can get the conclusion as follows: Switch 1 - bulb on and hot. Switch 2 - bulb off and hot. Switch 3 - bulb on but not quite hot. Switch 4 - bulb off and not hot.
You could actually extend this to 8 switches. I'm no science guy so I have no idea how well this would work in real life or what the exact variables would be but: - Let's assume there is only one bulb and you want to find out which switch controls it - Flip switches 5, 6, 7, and 8 on - Wait for a certain period of time - Flip switches 3 and 4 on, and switches 7 and 8 back off - Wait again, preferrably the same amount of time - Flip switch 2 on, 4 and 6 off again, and finally 8 back on again - Immediately go in the room to check the bulb - If the bulb is completely cold it's either switch 1 or switch 2 - If the bulb is warm to the touch from heating up for a short amount of time it's switch 3 or 4 - If the bulb is the most hot it can be then it'll be either switch 5 or switch 6 - If the bulb is slightly cool, but not completely cold, from warming up but then cooling down for a while, it'll be switch 7 or 8 - If the bulb is off, it's either switch 1, 4, 6 or 7, and if it's on then it's switch 2, 3, 5 or 8
I have two solutions. Smash a hole on the door so that you can see the bulb. Keep in mind that you are not "opening" the door. ANother solution is to check the wires within the switch to find out which has a connection.
That's why there was this emphasis on 'bulb'. I got puzzled why you didn't say 'lamp'. It drew my attention, because to say 'inside the room, there is a bulb' doesn't mean you can light it up, maybe it's just lying on the floor ;-) Good one!
@@davidjames1684 Except with LEDs in particular, it won't be the glass or plastic envelope which gets hot but the cap (the metal bit which screws into the bulb holder) and the plastic or netaji bit between there and the clear envelope. But it's probably easiest with any bulb to take an infrared digital thermometer into the room, so you can measure the temperate without getting your hands anywhere near the bulb itself.
Why is it a problem? It says that you can enter and check the bulb. Checkink doesn't meens that you can just look at it.. you can check it by looking at it AND touching it.
1) Turn switch 1 on and wait for a few minutes. 2) Turn switch 2 on then immediately enter and touch the bulb. (Don't turn off switch 1) ~ Situations: For switch 1, the bulb must be on and warm since its open for a long time. - For switch 2, the bulb must be on but cold since its only been open recently. - For switch 3, the bulb is off upon entering means the bulb is never been switched on. ~ You don't need to turn off switch 1. This way, you CAN touch the bulb since its NOT a DARK Room anymore. And if its still dark, its switch 3 since its the only turned off switch. :)
Who says you have to close the door behind you? How were you seeing the switches in the first place? There is likely to be light outside the door, so you can see a bit if the room is DARK.
There's light shining through from the other room so you can see into the dark room. And the problem stated to identify which switch turned on the bulb and report on that -- not actuallyt have the light turned on at the conclusion.
I remember back in JR high I was serving 3 days in house dentition (A whole school day plus after school until 5:30pm in dentition room). On my last day of detention at 3:30pm which was the end of the day for school also a Friday the teacher asked if one of us can figure out this riddle that person can go home early. Out of 10-13 students I was the one who figured this out and was let out early to go home. I am 25 now till this day it was probably the best Friday ever. Lol
You open the door and the light is off. As you move into the room to touch the bulb you hear the door close, the rattle of chains and the click of a padlock...and this is how he always captured his puzzle-loving victims...muahahaha!
The cracks around the door will let light shine through unless it's water (submarine) or light (darkroom) tight or hermetically sealed. If it's a regular door -- look at the edges -- if you see light - the switch worked then open the door.
Too many lacunas in the solution. 1. The bulb might be unreachable 2. The bulb might not get hot 3. The bulb might cool down before touching 4. Electricity is off (this is acceptable though)
In this type of puzzles, you should not think of all these possibilities. Puzzles are there to solve if there is logical solution. You can come up with lots of possibilities where this solution might not work, shouldn't think of this
I saw a version of this puzzle that involved 3 bulbs, and it's been pestering me all night. I assumed it was supposed to be a puzzle that can be solved mathematically, but it seems that there is no way to solve this puzzle without touching the bulb. The closest mathematical solution I can think of that doesn't involve touching the bulb, is to use the Monty Hall paradox. Flip a random switch, and if the bulb is on, lucky guess. If the bulb is OFF, then that eliminates one of the switches. Then using the Monty Hall paradox, you still have a 2/3 shot of guessing the right switch. So you guess a switch, then switch your guess and according to the Monty Hall paradox, your switched guess should be the correct answer. The problem with this however, is that the Monty Hall Paradox doesn't work 100% of time, so in the end there's no way of knowing for sure if your guess is correct. Now that I think of it, I'm not sure if that would work for the 3 bulbs version of this puzzle. But I'm wondering if there IS an actual mathematical solution to both versions, that doesn't involve touching the bulb.
The green plant hanging suggested to me the solution 🤓: I switch #1 on for ten minutes, then after turning it off I quickly switch #2 and #3 on, then turn #3 off. If now I open the door and check inside the room I can find what follows: 1) bulb cold and light off, solution is button #3 2) bulb cold and light on, solution is button #2 3) bulb hot and light off, solution is button #1 Cheers!!!
Wow, this is an old, but good, one. I remember first hearing this riddle back in 1995. I was able to solve it, but it took me a few days before the solution suddenly struck me :)
Let switch 1 remain closed . Keep switch 2 and 3 on. Just, before entering the room, switch off the switch no 2. Enter the room. If bulb glows, then switch 3 is real. If the room is dark, then touch the bulb. If the bulb is hot, then switch 2 is real else switch 1 is real. Had to think for few minutes, but got it sOlved :)
Same concept and result just slightly different. Turn in bulb 1, wait a while and turn it off, turn on bulb 2 and go inside. (Still flipping a total of 3 switches just a little differently) If bulb is hot but off, it’s switch 1 If bulb is on it’s switch 2 If bulb is off and cold it’s switch 3
i can say which switch it is without opening the door. all i do is switch on any two of them and wait for a month.if the bill collector comes that makes sure that it is one those two switches. and now i m gonna switch off one of em and wait for a month. if he comes again its the other one . if he doesnot come at all the both times it has to be neglected one.
Turn on switch 1 leave it on for ten mins then turn 1 off and turn 2 on and open the door if the light is on the it’s the 2 switch if it’s off and hot its 1 or if it’s off and cold it’s the 3 switch
Your solution is to turn switches 1 and 2 On, wait a few minutes, turn switch 2 Off and open the door. My solution is to turn only switch 1 On, wait a few minutes, turn switch 1 Off and turn switch 2 On. - If the bulb is LIT then switch 2 is the correct switch - if the bulb is NOT LIT then you "feel" the bulb - if the bulb feels warm/hot then switch 1 is the correct switch, otherwise it's switch 3. ---------- Yes, I know it's pretty much the same solution. But, mine is better because I came up with it.
Turn switch 1 on, check the kWh meter if it runs faster, repeat for other switches, switch witch highest power consumption is the switch that turns on the light.
sabse pehele 1st switch on karna hai then after sometime 1st switch ko off then 2nd switch ko on and then enter the room agar bulb garam hoga and nahi glow kar rha hoga means 1st switch hoga agar bulb glow kar rha hoga toh 2nd switch hoga agar bilb na hi garam hoga or na hi glow kar rha hoga then 3rd switch hoga
you can also turn on switch number 1 and wait. Than you turn the switch number 1 off, turn the switch number 2 on and enter. If the bulb is off and warm means it´s the switch number 1, if it´s on and cold it´s the number 2 and if it´s off and cold it´s the number 3
Better explanation would have been: turn on switch 1 and leave it on for one hour then switch it off, then turn on switch 2 and walk in the room. If the bulb is off and hot, it’s switch 1. If the bulb is on, it’s switch 2. If the bulb is off and cold, it’s switch 3.
My solution .. before I look at yours. Turn on switch 1 and 2 for 5 minutes or so Turn off switch 2 Go into the room If the light is on it's switch 1 If the light is off but the bulb is hot it's switch 2 If the light is off and the bulb is cold it's switch 3
Firstly on the first switch and kept it on for five minutes and now off it.now turn on the second switch and goes inside to the room ,if the bulb is glowing then the second switch but if it is not glowing then touch the bulb and feel that it is hot or not. If it is hot then the first switch else the third switch.
A a puzzle should have a salution that no one even expected like your other puzzle but but it has so expected answer that did even seem like puzzle to me
What if the bulb is right on the ceiling out of reach? Better yet, you know there is a bulb but not exactly where in the room it is (centered on ceiling, near the corners, above or centered on the wall). Also most modern bulbs (LED/CFL) do not get hot. This is an incomplete problem
lets switches be switch1,switch2,switch3; on switch1 and switch2 for long time then off switch1 and on switch2 and switch3 then enter the room immediately. if light is off then answer is switch1 if light is on and hot then answer is switch2 if light is on but not hot then the answer is switch3
No time limit eh? Include a 4th switch, leave it on for 10,000 hours, then flip it on and off 10,000 times, then perform the usual routine for the first 3 switches. - If the bulb is burnt, it's the 4th switch :D
i would switch ON 1 for 10 min then OFF, then switch ON 2 and go in the room. If the bulb is ON, then 2 controls the bulb, if it's off and hot I'll know its 1, if it's not HOT or ON I'll know its 3.
And what if switches are installed upside down (so they seem to be off, but bulb is actually already on)? It's common case in some houses. Not for real life.
When i tried i thought on the number 2 switch for 10 to 5 min then off the number 2 switch then on the number 3 switch then look in the room if its on its number 3 if its off then touch the light if its hot its number 2 if its not its number 1
This one is a bad way of solution... There is no mention that the bulb gets hot or you can touch it... nothing. Not good puzzle like other's I get in this channel
You can only say this is the answer if you tell us that's the light is hanging low enough to be able to reach it because most people see a light up in the ceiling and it is intuitive that you know you can't reach it to touch it, so you have to at least say the ceiling is low enough to be able to touch it which you did not.
Can't you just switch 1 on for a while and then turn it off and turn on switch 3 and open the door? if the room is dark you know 3 did not make a difference so you feel the bulb. If it is warm then it was switch 1, if it is cold it was switch 2. If it is light when you walk in you know it was switch 3 and don't even have to touch the bulb.
Fip one switch for 10 minutes then turn it off. Fip another switch and enter the room. If the light is off and cold then the switch you did not flip is the one, etc...
1 step i will open the door I will try all the buttons on and off. If the light comes out of the room when the button is on. The button is of the room.
At 0:24 the picture shown by u of a room which has bulb and the closed door no window how's it possible to see a bulb in a dark when there is no source of light to enter the closed room except the bulb which is off
1.hot light 2.hot dark 3.cold light 4.cold dark in fact, you can use 2 options to test 4 switches. There is an additional question: There is a same situation but 5 switches, how can you solve this?
1. Turn on 1st switch and keep it on for a few minutes.
2. Switch off the 1st switch and turn on 2nd switch.
3. Immediately enter the room.
A. If bulb is on, 2nd switch it is.
B. If bulb is off and warm, then, 1st switch.
C. If bulb is off and cold, then, 3rd switch.
Tathagata Dutta Nice one!
Your answer is bang on target I agree with you here.
What if it is a LED bulb.. It does not get hot
@@iamrajatgoyal great
@@iamrajatgoyal I've managed to burn myself on those once or twice. If you wait long enough they do get hot, just not scorchingly so.
This also works for 4 switches and 1 bulb puzzle. If you turn on 1st switch and 2nd switch to keep it on for a few minutes, then turn off the 2nd switch and turn on 3rd switch. Go into the room immediatly to touch the bulb after turning on the 3rd switch, you can get the conclusion as follows:
Switch 1 - bulb on and hot.
Switch 2 - bulb off and hot.
Switch 3 - bulb on but not quite hot.
Switch 4 - bulb off and not hot.
Although practically a Bulb gets hot very fast. But just for the sake of puzzle your question and explanation is quite valid :)
But in this case more than 1 ie 2 buttons are on while entering the room which is against one of the constraints of problem
What if it is a LED bulb
You could actually extend this to 8 switches. I'm no science guy so I have no idea how well this would work in real life or what the exact variables would be but:
- Let's assume there is only one bulb and you want to find out which switch controls it
- Flip switches 5, 6, 7, and 8 on
- Wait for a certain period of time
- Flip switches 3 and 4 on, and switches 7 and 8 back off
- Wait again, preferrably the same amount of time
- Flip switch 2 on, 4 and 6 off again, and finally 8 back on again
- Immediately go in the room to check the bulb
- If the bulb is completely cold it's either switch 1 or switch 2
- If the bulb is warm to the touch from heating up for a short amount of time it's switch 3 or 4
- If the bulb is the most hot it can be then it'll be either switch 5 or switch 6
- If the bulb is slightly cool, but not completely cold, from warming up but then cooling down for a while, it'll be switch 7 or 8
- If the bulb is off, it's either switch 1, 4, 6 or 7, and if it's on then it's switch 2, 3, 5 or 8
@@Quazar__1 Then it wouldn't work lmao.
I have two solutions.
Smash a hole on the door so that you can see the bulb. Keep in mind that you are not "opening" the door.
ANother solution is to check the wires within the switch to find out which has a connection.
What if the door room was far away? Like the Basement?
bro created the box
That's why there was this emphasis on 'bulb'. I got puzzled why you didn't say 'lamp'. It drew my attention, because to say 'inside the room, there is a bulb' doesn't mean you can light it up, maybe it's just lying on the floor ;-) Good one!
It’s not logic, it’s just being sneaky and doing something that seems to break the rules
Using logic. What’s your point here?
Remove the switch panel and interconnect all the wires. Problem solved. 😜
I thought the same 1st
But it is dark and the room is locked
@@aumchaudhari9242 the switch panel is not in the room. also, the door isn't locked anyways.
Yeah this doesn't work anymore for most bulbs...
Wrong. LEDs and CFLs both get warmer than room temperature.
@@davidjames1684 Except with LEDs in particular, it won't be the glass or plastic envelope which gets hot but the cap (the metal bit which screws into the bulb holder) and the plastic or netaji bit between there and the clear envelope. But it's probably easiest with any bulb to take an infrared digital thermometer into the room, so you can measure the temperate without getting your hands anywhere near the bulb itself.
Your explanations are logical too. The problems are interesting.
The problem with the solution is that you CAN touch the bulb in the DARK room.
Why is it a problem? It says that you can enter and check the bulb. Checkink doesn't meens that you can just look at it.. you can check it by looking at it AND touching it.
1) Turn switch 1 on and wait for a few minutes.
2) Turn switch 2 on then immediately enter and touch the bulb. (Don't turn off switch 1)
~
Situations:
For switch 1, the bulb must be on and warm since its open for a long time.
-
For switch 2, the bulb must be on but cold since its only been open recently.
-
For switch 3, the bulb is off upon entering means the bulb is never been switched on.
~
You don't need to turn off switch 1. This way, you CAN touch the bulb since its NOT a DARK Room anymore. And if its still dark, its switch 3 since its the only turned off switch. :)
Who says you have to close the door behind you? How were you seeing the switches in the first place?
There is likely to be light outside the door, so you can see a bit if the room is DARK.
Try this at morning 😂🤣
There's light shining through from the other room so you can see into the dark room. And the problem stated to identify which switch turned on the bulb and report on that -- not actuallyt have the light turned on at the conclusion.
I remember back in JR high I was serving 3 days in house dentition (A whole school day plus after school until 5:30pm in dentition room).
On my last day of detention at 3:30pm which was the end of the day for school also a Friday the teacher asked if one of us can figure out this riddle that person can go home early.
Out of 10-13 students I was the one who figured this out and was let out early to go home.
I am 25 now till this day it was probably the best Friday ever. Lol
yes I find it thank you.
I had shared this video with all my WhatsApp groups
Good one
Supper nice video
Thanks Preethi.... a new light&switch video will be posted on this weekend.
Now with LED bulb, you'll have to wait for days if you want it to be hot
Just touch it's bottom, where electronics is. It becomes hot.
You open the door and the light is off. As you move into the room to touch the bulb you hear the door close, the rattle of chains and the click of a padlock...and this is how he always captured his puzzle-loving victims...muahahaha!
You are my kinda soul.
Listen mate
Become a writer.
You are likely to be eaten by a grue.
good one
The cracks around the door will let light shine through unless it's water (submarine) or light (darkroom) tight or hermetically sealed. If it's a regular door -- look at the edges -- if you see light - the switch worked then open the door.
Too many lacunas in the solution.
1. The bulb might be unreachable
2. The bulb might not get hot
3. The bulb might cool down before touching
4. Electricity is off (this is acceptable though)
In this type of puzzles, you should not think of all these possibilities. Puzzles are there to solve if there is logical solution. You can come up with lots of possibilities where this solution might not work, shouldn't think of this
I'm guessing you got it wrong.
@@chicagoblackhawks9840 lolwut
I saw a version of this puzzle that involved 3 bulbs, and it's been pestering me all night. I assumed it was supposed to be a puzzle that can be solved mathematically, but it seems that there is no way to solve this puzzle without touching the bulb. The closest mathematical solution I can think of that doesn't involve touching the bulb, is to use the Monty Hall paradox. Flip a random switch, and if the bulb is on, lucky guess. If the bulb is OFF, then that eliminates one of the switches. Then using the Monty Hall paradox, you still have a 2/3 shot of guessing the right switch. So you guess a switch, then switch your guess and according to the Monty Hall paradox, your switched guess should be the correct answer. The problem with this however, is that the Monty Hall Paradox doesn't work 100% of time, so in the end there's no way of knowing for sure if your guess is correct.
Now that I think of it, I'm not sure if that would work for the 3 bulbs version of this puzzle. But I'm wondering if there IS an actual mathematical solution to both versions, that doesn't involve touching the bulb.
The green plant hanging suggested to me the solution 🤓:
I switch #1 on for ten minutes, then after turning it off I quickly switch #2 and #3 on, then turn #3 off. If now I open the door and check inside the room I can find what follows:
1) bulb cold and light off, solution is button #3
2) bulb cold and light on, solution is button #2
3) bulb hot and light off, solution is button #1
Cheers!!!
If the bulb if off then how can you touch is!!!
It's Dark room!!
Point
Since you have opened the door there is some light I guess.
I hope you're joking
Use your mobile phone flash
As many have pointed out below, with LED bulbs, this is really no longer a valid puzzle.
I bet arisu watched these vids in his neet life
Like many riddles, so easy when you know the answer
Wow, this is an old, but good, one. I remember first hearing this riddle back in 1995. I was able to solve it, but it took me a few days before the solution suddenly struck me :)
I will open the switch board and check with multimeter as it was not mentioned so we can use multimeter and check current😊
The new bulbs don't heat, but its a cool one.
Thanks Adrian :)
They don't generate much heat but it is still enough to feel to the touch...you just won't burn your finger-tips the way they used to :)
@@jessicataylor7174 Especially the bases of some with the heat sink. Just run the bulbs for ten minutes to be sure.
Let switch 1 remain closed . Keep switch 2 and 3 on. Just, before entering the room, switch off the switch no 2. Enter the room. If bulb glows, then switch 3 is real. If the room is dark, then touch the bulb. If the bulb is hot, then switch 2 is real else switch 1 is real.
Had to think for few minutes, but got it sOlved :)
bhai sun....aapka 3 crore ka package mai deta hu...woh bhi cash.
Same concept and result just slightly different.
Turn in bulb 1, wait a while and turn it off, turn on bulb 2 and go inside. (Still flipping a total of 3 switches just a little differently)
If bulb is hot but off, it’s switch 1
If bulb is on it’s switch 2
If bulb is off and cold it’s switch 3
i can say which switch it is without opening the door.
all i do is switch on any two of them and wait for a month.if the bill collector comes that makes sure that it is one those two switches.
and now i m gonna switch off one of em and wait for a month. if he comes again its the other one .
if he doesnot come at all the both times it has to be neglected one.
Turn on switch 1 leave it on for ten mins then turn 1 off and turn 2 on and open the door if the light is on the it’s the 2 switch if it’s off and hot its 1 or if it’s off and cold it’s the 3 switch
What if they are LED
Exactly my question
what if wires are faulty .lozzzzzzzzzz :P
To kya LED heat nhi radiate krta h kya
They also get warm
What if the switches are set in Reverse & you don't know one way or the other? Now that's hard!!!
Thnks for ossm video this video is just increased my IQ level and so much will help me for competitive Exams❤
Your solution is to turn switches 1 and 2 On, wait a few minutes, turn switch 2 Off and open the door.
My solution is to turn only switch 1 On, wait a few minutes, turn switch 1 Off and turn switch 2 On.
- If the bulb is LIT then switch 2 is the correct switch
- if the bulb is NOT LIT then you "feel" the bulb
- if the bulb feels warm/hot then switch 1 is the correct switch, otherwise it's switch 3.
----------
Yes, I know it's pretty much the same solution. But, mine is better because I came up with it.
Turn switch 1 on, check the kWh meter if it runs faster, repeat for other switches, switch witch highest power consumption is the switch that turns on the light.
Here from Alice in Borderland 😁😁😁
Thanks Mohammed Ammar, this channel is exactly what I was looking for.
..Gr8 job👍👍
Asna Anum ..... you are welcome
@@LogicalAmmar you must reply for the questions which are mentioned above rather than welcoming.
@@kotreshhosalli6169 which question ?
This is a good puzzle, except that now these new bulbs don't heat up anymore.
All you have to do is, "Think Logically"...
We can also check through the narrow gap between the floor and the door
The premise of the puzzle was poorly narrated. But the logic was really good.
I was asked same question in interview for software engineer in united health group company
seriously? it is a puzzle asked in school magazines.
Ur video editing is jzt incredible, even a deaf person can understand it....
Nice one 👍
sabse pehele 1st switch on karna hai then after sometime 1st switch ko off then 2nd switch ko on and then enter the room
agar bulb garam hoga and nahi glow kar rha hoga means 1st switch hoga
agar bulb glow kar rha hoga toh 2nd switch hoga
agar bilb na hi garam hoga or na hi glow kar rha hoga then 3rd switch hoga
I had decoded it few years back .
if you remember
By the way good puzzle is very good
👍👍👍👍👍
Yeah I remember 😂😂😂😂
Nice
Very good
Now all you need is three perfectly logical people, each of whom can deduce that the others will deduce that he will deduce their deducing...
you can also turn on switch number 1 and wait. Than you turn the switch number 1 off, turn the switch number 2 on and enter. If the bulb is off and warm means it´s the switch number 1, if it´s on and cold it´s the number 2 and if it´s off and cold it´s the number 3
aapka knowledge toh kamal ka h bhai.
Loved this one ❤
Thanks Rikesh :)
Better explanation would have been: turn on switch 1 and leave it on for one hour then switch it off, then turn on switch 2 and walk in the room. If the bulb is off and hot, it’s switch 1. If the bulb is on, it’s switch 2. If the bulb is off and cold, it’s switch 3.
My solution .. before I look at yours.
Turn on switch 1 and 2 for 5 minutes or so
Turn off switch 2
Go into the room
If the light is on it's switch 1
If the light is off but the bulb is hot it's switch 2
If the light is off and the bulb is cold it's switch 3
Good one, Which editing software are you use?
Good
I was asked this puzzle in an interview 😬
Mr. Spock would have figured this out in just seconds!!
SUPER PUZZLE
I'll switch all 3 and move in
Then how will you know which is the correct switch for the bulb...
Hahahaha
good one !
Blew my mind 😅
Firstly on the first switch and kept it on for five minutes and now off it.now turn on the second switch and goes inside to the room ,if the bulb is glowing then the second switch but if it is not glowing then touch the bulb and feel that it is hot or not. If it is hot then the first switch else the third switch.
Mind blowing 😆
What is the solution if bulb is led(means no heat)?
asked in SAP LABS interview
What if it is day and corridor has windows so no need of light (No waste of power)
This puzzle was used on one of Alice in Borderland’s games.
what if the bulb didn't illuminate with the switch 1 and 2? How would you know that 3rd switch is the correct one?
Vera level
This is the very old question , nearly the year of 2000-01 we found answer for this
A a puzzle should have a salution that no one even expected like your other puzzle but but it has so expected answer that did even seem like puzzle to me
that door at time 0:29, completely out of prospect. I wanted to rip off my eyes :)
I thought of the idea of touching the bulb but decided LY method would be more mind boggling... Hmmm
What if the bulb is right on the ceiling out of reach? Better yet, you know there is a bulb but not exactly where in the room it is (centered on ceiling, near the corners, above or centered on the wall). Also most modern bulbs (LED/CFL) do not get hot.
This is an incomplete problem
lets switches be switch1,switch2,switch3;
on switch1 and switch2 for long time
then off switch1 and on switch2 and switch3 then enter the room immediately.
if light is off then answer is switch1
if light is on and hot then answer is switch2
if light is on but not hot then the answer is switch3
No time limit eh?
Include a 4th switch, leave it on for 10,000 hours, then flip it on and off 10,000 times, then perform the usual routine for the first 3 switches.
- If the bulb is burnt, it's the 4th switch :D
What if it is led?
Bro, it also gets heated by small amount.
@@gamingverse511
Yes
Rurn 1 on, Wait. Turn 1 off And 2 on. Open doors.
nice one
i would switch ON 1 for 10 min then OFF, then switch ON 2 and go in the room. If the bulb is ON, then 2 controls the bulb, if it's off and hot I'll know its 1, if it's not HOT or ON I'll know its 3.
What if the bulb is LED, It doesn't heat ?
What about three switch and three light bulb, can you solve it?
This puzzle was in Alice in Borderland - Season 1.!! 🤩
I was wondering, if someone would end up here after watching the show :D
Agar tum bulb ko touch Kar sakte ho
To hum dusri taraf se wall me gaddha nahi khod sakte kya
Kuch bhi
Sahi hai
And what if switches are installed upside down (so they seem to be off, but bulb is actually already on)? It's common case in some houses. Not for real life.
Easy one
When i tried i thought on the number 2 switch for 10 to 5 min then off the number 2 switch then on the number 3 switch then look in the room if its on its number 3 if its off then touch the light if its hot its number 2 if its not its number 1
I've heard this before and it assumes all lightbulbs generate heat which is wrong. Any puzzle bases on such assumptions is a poor one.
SSchithFoo i heard this puzzle years ago (my version was 3 bulbs, one to each bulb). Back then incandescent was the norm.
Not all dogs bite, but I strongly would suggest not wanting to pet a stray one.
If you assume the lightbulbs don't generate heat, then what could possibly be your answer?
This one is a bad way of solution... There is no mention that the bulb gets hot or you can touch it... nothing. Not good puzzle like other's I get in this channel
I would just switch on the 1st switch and peek from below the door. And similarly for all switches
You were not listening to the description of the situation.
You can only say this is the answer if you tell us that's the light is hanging low enough to be able to reach it because most people see a light up in the ceiling and it is intuitive that you know you can't reach it to touch it, so you have to at least say the ceiling is low enough to be able to touch it which you did not.
Can't you just switch 1 on for a while and then turn it off and turn on switch 3 and open the door? if the room is dark you know 3 did not make a difference so you feel the bulb. If it is warm then it was switch 1, if it is cold it was switch 2. If it is light when you walk in you know it was switch 3 and don't even have to touch the bulb.
What if the bulb does not heat up? What if it is made of a material that prevents heat from radiating?
bhai PV=nrt ko differentiate kroge toh enthalpy bhi nikal aaegi...aur bhai ek bar differentiate kroge toh tatti bhi nikal aaegi
Fip one switch for 10 minutes then turn it off. Fip another switch and enter the room. If the light is off and cold then the switch you did not flip is the one, etc...
Turn on all the switches and then go to the room then remove the bulb and short the wire together. And check which switch is blown up.
This doesn't work for LED bulbs - as they don't get hot. It needs to say an incandescent/halagon bulb is in the room.
1 step i will open the door
I will try all the buttons on and off.
If the light comes out of the room when the button is on. The button is of the room.
Nice
This puzzle I saw on a Japanese series on Netflix. "Alice in Borderlands"
NOT a logic puzzle. Fun piece of history regardless.
At 0:24 the picture shown by u of a room which has bulb and the closed door no window how's it possible to see a bulb in a dark when there is no source of light to enter the closed room except the bulb which is off
1.hot light
2.hot dark
3.cold light
4.cold dark
in fact, you can use 2 options to test 4 switches.
There is an additional question:
There is a same situation but 5 switches, how can you solve this?