Can you solve the multiplying rabbits riddle? - Alex Gendler
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- Опубліковано 9 січ 2019
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After years of experiments, you’ve finally created the pets of the future - nano-rabbits! They’re tiny, they’re fuzzy ... and they multiply faster than the eye can see. But a rival lab has sabotaged you, threatening the survival of your new friends. Can you figure out how to avert this hare-raising catastrophe? Alex Gendler shows how.
Lesson by Alex Gendler, directed by Artrake Studio.
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Simple answer: pull the lever immediately. If you're doing something that can take over the world easily and you messed up do math later stop machine now
When ppl use 100% of their brains
The 7th row was the best time to pull the lever because you still get a lot of rabbits
Nah if you got something that *might* destroy the world, but it hasn't *yet*, it's good data to push it as far as possible. That, or just to see what happens.
Yeah
I guess it wouldnt be a riddle tho
i just put the rabbits in the infinite hotel
@Joshua Reynolds it's a reference to an old video.
ua-cam.com/video/Uj3_KqkI9Zo/v-deo.html
Lol
That won't work because of the gaps in the doors
How you going to get one
And if you buy one that would be expensive
And if you book a hotel that would be expensive too
@@xxdarrenyeboixxxxyoxx5536 chill it's just a joke, and it's a reference to an old TedEd video
Me: Why are we learning this?
Teacher: This math has real-world applications.
The applications:
Yes
Exponential growth has real applications, TED-ED just wants to make the videos enjoyable
@@sankalp2520 inflation counteracts that
My teachers are sicere, they just respond "because there's a thing called vestibular" (it's a test to get into uni in my country, literally every uni requests your score in the main one (enem) for you to be accepted there)
Pascal's Triangle, anyone learned this at school or an after-school math class
"Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should."
I understand the reference
That’s what I call being an absent minded scholar.
@@kevinlane1219 wdym
Jurrasix park right?
@@papasscooperiaworker3649 Jurassic *
So I'm smart enough to create nanorabbits but can't even install proper antivirus software. Checks out.
Duh you find out that your rival company has bought the company that provides your antivirus software.
Nothing is unhackable
Your specialty is Biology, not Computer Engineering.
Well the solution is..
..hack them back
install antivirus is easy tho
So the rival company's plan was to die?
Stonks
Nanocats would have there own army of Nanocats so they would win because cats have claws
CuttleCraft Emexis boi I had a rabbit and 4 cats once and that rabbit scared all but one of them. The nano rabbits would win
CuttleCraft Emexis wouldn’t the cats take over the world then?
Matthaeus The cats would obviously be controlled by the rival company because they never said anything about the rival company being hacked
Not really a riddle... but you would pull the safeguard lever no matter what, after it was determined the experiment was compromised in any way.
Well, i didnt expect you to be here
Ted-Ed: *listen here you little sh-*
Yeah that was my reaction
@@washmonument Me neither
You would pull the fund away from something that can destroy the ecosystem lie that
Ted Ed: Do you have to pull the shutdown lever or not?
Me, a thinking man: *Pulls*
If you’ve invented something that can end the world, You always pull the emergency lever. ALWAYS!
You can do the math afterwards, and I would encourage people to do so. This gives you the added bonus of actually having the time to do the calculation by hand for as long as you need to.
Yeah
Agreed.
The entire purpose of an emergency shutdown is so that if something goes wrong, like say, a calculation error that can cause an apocalypse occurs, you can revise the calculations WITHOUT risking global destruction
I am the 1300th like.
Imagine if the container breaks while the guy’s counting ZEROS!
Scientist 1: We need to pull the lever!
Scientist 2: No! We need to figure out how many zeros there are in the product so we can decide if we need to pull the le-
Scientist 1: *pulls lever*
Scientist 2: But...but...zeros :(
scientist 2 is my life
Bunch of money down the drain, those scientists invested a lot of money ya know
Misty Matchy expensive rabbits
Scientists 1: screw zeros, I just saved the world!
LOL! C-..:
I'm crying and laughing so hard...
Pull the lever, Kronk!
*accidently releases rabbits*
WRONG LEVEEEERRRR...
Why do we even HAVE that lever?!
lol. i'm dead. i can still hear her scream "wrong leveeeerrrr!"
Why do we even have that lever!?
.... wait .... can't you... EAT THEM
@@ZBreezee-nb2rl That would rather a different kind of smart. See, baking microscopic rabbits would be generic engineering, which would require very little computer knowledge. Programming anti-virus software would require the scientist to not only know about computers, but be really good at writing code.
Me: Ahh, I can finally start my Nano-rabbit production.
Assistant: Snail, your calculations are wrong. Do we need to pull the emergency shut-down?
Me: No need. I'll simply do the math instead.
Assistant: Sir
assistant: so you're gonna do all this math in the few minutes we have left
me: *pulls out notepad*
assistant: BY HAND?!?!
Bro why is the Tedded community so funny.
And yes the Ted ded joke was intended.
@@hairje1340
Where is Ted? I have a bone to pick with that bum.
I automatically think "Sir"
"You're a genius."
@@eclecticsoffy😂 oversimplified reference.
The scientist is clearly a genius if he was able to fit more rabbits in a lab than there are particles in the visible universe.
No, the number of atoms/particles in the visible universe is 100 quintillion times more than the rabbits in the chamber. This is because it scalws logarithmically. 1*10^80 is only one tenth of 1*10^81, and the number of atoms in the universe is around 10^100
@@mrinfinity5557 r/woosh
@@PersonGuy-xh4zj nah, the dude probably honestly didnt know the atoms in the universe. Its a believable mistake
@@mrinfinity5557 the number of atoms in the universe is between 10^78 to 10^82. not 10^100.
Not that much of a genius if he decided to create a species with the ability to overpopulate the entire earth to extinction within minutes
I would’ve directly pulled the emergency lever instead...
Put this guy in charge, please.
does it kill the rabbits?
@@soufian2733 doesn't seem to
Maybe the lever needed the exact number input in a machine before pulling it, otherwise it's automatic security feature would let the rabbits break free
Same. I would not risk it for the world. I rather start over again than making a risk.
They multiply faster than my math teacher expects me to
First and before famous and 10 likes
Eighty
100th
😂😂😂😂😂
505th like
why would anyone want nano-size rabbits, you cant pet them cus they're too small and you might crush them, it defeats the whole purpose of having cute and fluffy pets
Well, there's more than enough of them for every person on earth to have as many rabbits as there are people on earth, and then for each of those rabbits to be accompanied by as many rabbits as there are people on earth. So I guess just pile them up until the nano -rabbit nano-mountain is big enough to pet?
“You’re calculator is broken”
Me: *uses calculator*
cheater XD
Modern problems require modern solutions
-69th- likes
Can't the scientist just pull the emergency lever, instead of going through so much trouble
They could, but then they could miss out on rabbit production, I guess.
Risk vs profit and all that stuff.
If I fail, everyone dies
If I success, I'll get money
SEEMS WORTH IT
@@tcxd1164 BOY THIS IS THE FATE OF THE WORLD HERE
nuclear bombs
@@censored4680
BUT MONEY /s
I, for one, welcome our new rabbit overlords
Kylie underrated comment
r/brandnewsentence
That would be fine
And besides, if there are too many of them, you can just squish a few with your feet
Simpsons reference! Lol
me: oh look! a ted ed riddle, let's watch it
brain: here we go again
:D
But there gonna escape
*why*
@wat up eh, Schrodinger gave us Gigantic cats. Who cares?
They’re*
I love inside jokes
Answer 1: fermi estimation.
Answer 2: PULL THE DAMN LEVER
wrongggg leverrrrr
@@wolfmistresswilderr6579 Why do we even have that lever?
wow
I learned fermi estimation from game theory
Answer 3 : find the green person that sabotaged your system.
What? You think I'm making a green eye joke?
The first TED Riddle I solved. I feel like crying tears of joy.
Congratulations!
@@TEDEd now, give me a riddle that i can answer so i can feel the tears of joy too :)
The first one I solved was the coin one
@@dylanger1015 was that the dark coin riddle?
Mine was Stolen Rubies hahah w/ logic It really was tears of joy ryt
You know when you make a species of animals that reproduce at incredibly fast speeds to sell as pets, and they almost destroy the world while still in the lab, and don’t expect them to do the same once you sell them.
Maybe they have a way to make them sterile after being sold
@@infinitestudy4153 that would still mean that if they fail that part of the process even once, the entire world would be in danger
@@JJJSmit9026 my hypothesis is that they succeeded to do so in the first place. Because him pulling the lever and pets stop multiplying must be the effect to prove that.
Or worst it could be poison 😱
They wouldn't be sold as pets. They would be sold as paste.
We all learned that watching Star Trek- The Trouble with Tribbles. Later the Klingon engine room learned.
Me: yeah screw the maths, PULL THE DAMN SHUTDOWN LEVER!
Don't do maths
Just pull the Emergency lever
Finally I solved a Ted Ed riddle
Cause I was too lazy with the math and would have just pulled the lever anyway
So in other words, you did not solve it right?
Gary Lu Productions no, in other words he took a short cut
@@GaryLuKOTH but he still got the correct answer, which was to pull the lever ¯\_(ツ)_/¯
The Lonely Mimikyu XXX Read the question again. It also asked how many zeroes are at the end of the number and he did not answer that part. A blank answer is technically not a correct answer.
@@GaryLuKOTH It was to whether or not to pull the lever. He pulled the lever. The answer was "pull the lever".
Me: literally accepts challenge and starts multiplying everything without a calculator that took me about 30 mins of head scratching and mental calculations because the numbers kept getting bigger
Me: finally finishes multiplying everything and sees answer just to realize that I only needed the zeroes the whole time and I was even very far from the answer I wrote
Me: well fack this why did I signed up for this in the first place
Me just pulls the damn lever
Easy:
Step 1: Check if you have green eyes
Step 2: Ask the rabbits to stop breeding
Step 3: Get thrown into the volcano because you didn't have green eyes
No
@@akisa7865 Step 4: realize that you were colorblind and actually had brown eyes
Why didn't he just pull the emergency lever first, THEN calculate it?
That would have ruined the experiment.. there was a possiblity that the answer would be containing less than 80 digits in which case he would let the experiment go on...
Nano rabbit are expensive, and then all the share holders would want answers (or punishment) to why you didn't even try to resolve the issue
Better question would be why didn’t he pull the lever, regardless? Nothing said the rabbit only breed once! Not to mention that this abomination should’ve been born in the first place!
Really now, though. I don’t think this rabbit can overrun the earth. Once it came out of the cage, it can’t reproduce. Because all of them can be considered as being in the same box
Harsh Sharma yeah, but if that were the case, he could just re calculate once the lever was pulled and see if the experiment could continue.
Sajuuk E it was very clear in the rules that the rabbits would breed once. If a rabbit bred more than once, then the rules would’ve been written incorrectly. To do something once, is to only do it one time.
Am...Am I supposed to be *scared* of a rabbit apocalypse?
I guess
Yeah
Well, think of the poor carrots
That is what I was thinking, too!
*Just, let the little bunnies take over as our overlords*
actually, my bunny made me bleed a lot once.
I wish they have pulled the emergency lever before nanorabit-19 takes over.
Can you solve the multiplying rabbits riddle?
Me, a cautious intellectual: who cares! If it’s something that runs the risk of destroying the world, you ALWAYS pull the emergency lever. ALWAYS!
Yes... OR, and hear me out, OR... It's time to do math!!! Weee
@@RobMedellin If it’s an apocalypse style situation, the math is an afterthought. First, you pull the emergency lever, and then you ask yourself “how many zeros can I get in the bottom box?“ Save the world first, do math later.
There's a problem, though. What if the person, likely, is a nihilist?
ALWAYS PULL IT!!
Except for climate change it seems, where people demand 100% proof of danger before accepting change 🙄
If my computer had a virus and I had no calculators I would’ve pulled the emergency lever right away
One more ted ed riddle
That i can't solve
With enough of these riddles you'll start to see how to solve them and they'll become easy. Also math helps. Few years back I was also not able to solve most of those riddles. But after watching and trying for myself all of them and much more (I just love them), this riddle wasn't a problem for me.
I watch so I can see the story I don’t quite understand the math
My guess was 36 0s sssooo i mean I was only 1 0 off....
@@fireslash0407 Very simple maths : the prime factorization of 10 is 2*5 . The p adic valuation of 5 (which will lack of course since 2,4,6,8 provide 2) in the last box is clearly 35, you can just think of Pascal's triangle.
how relatable
Notably, you can find the precise number pretty quickly as well, it is 1^1*2^7*3^21*4^35*5^35*6^21*7^7*8^1. It follows the same logic as the video, except the video is only tracking how many times 5 divides into each number. Back of the envelope approximation with tell you you’re pushing 80 digits even without the truncated zeros information.
I was looking for this comment, but it has so few likes ... There are only jokes in the top, it seems that few people actually tried to solve the problem
Fun fact: This riddle wasn't solved when a situation like this happened in Australia many decades ago.
What was the situation?
@@nicholasemjohnson47 Rabbits multiplied out of control like in this riddle.
spiders multiplied in boxes not rabbits
Can we talk about how the dude from nano cats could have ended the world in mere seconds, but luckily, we have basically a god of math who can do the math in a few microseconds?
Now, a better question... Would you pull the lever if the rabbits populating were substituted for Subnautica peepers?
@@survivorofthecurse717 I'd do it for the subnautica penguins.
Idk. Penglings are cute, but they're not peepers...
@@survivorofthecurse717 well thats your opinion.
@@iluvmilktea3224 I would let them live if they were cuddle or hoverfish
I know I probably can't solve it, but always fun to watch
Me: Spends 30 minutes on this riddle
Also me: gets it wrong
I just kept multiplying until I got the last number lol
why not just pull the lever at the start before doing the math
I would have just pulled the emergency lever in the first place.
I solved it a different way
The bottom square is equal to: 1*2^7*3^21*4^35*5^35*6^21*7^7*8 (using the 7th row of Pascal's triangle)
If you split this into its prime factors you get
2^101*3^42*5^35*7^7
Since the prime factorisation of 10 is 2*5, the number of factors of 10, or trailing zeros, is equal to the number of times you can make 2*5 in this product. Since there are a lot more 2s than 5s, the answer is the number of times 5 appears - so 35 zeros
Wow that's brilliant and correct. I thought of it in similar terms too. :)
More obviously i think 😀😀😀😀love it this way literally
This is exactly how I did it. Then afterwards realised I only needed to keep track of the powers of 2 and 5, all the 3s and 7s are there for completion, but are not needed for this puzzle.
Actually if u observe carefully its the same thing . Counting 0 is same as 5 cause there are enough 2's
I did it the same way
Good thing I watched this video for when I run into this exact situation in real life.
And it only works for very small rabbits
step 1: confirm you have green eyes
step 2: ask the rabbits to stop reproducing.
But having green eyes means you can ask them to stop.
@@slimeboy2048 is a meme
Hare-raisingly.
I see what you did there.
It's a rabbit not a hare
@@prerakgames4668 you missed the joke
oh hi there
@@thetexc he didn't miss the joke. The joke doesn't really work since they're rabbits, not hares.
Assistant: oh we’ve been hacked and we need to find da zeros
Me: screw this *pulls emergency lever and walks out to assault the hacker*
Assistant: wait but math...
better safe than sorry
you've stolen this comment
"Your devices and calculators are all malfunctioning"
Me: of course they are
Honestly, this sounds like a question someone would put on the SATs. Great job
Wait, the number of nano rabbits each cell can hold is equal to the number of particles in the observable universe‽
That would make them Picorabbits.
Are you sure they're not femtorabbits, @@pepperonipizza8200?
@@Taric25 Perhaps
@@Taric25 They aren't femtorabbits. The vid said they were hermaphroditic.
@@wookywok Is that a berserk reference?
I could just pull the lever now but...
Ill do some maths first and check.
Seriously?
There's nothing to worry about, just pull it now.
I solved this by using the idea of multiplying 2's and 5's together to get 10. after noticing the pattern of pascal's triangle in the exponents of each number, it become pretty straight forward from there. Turning the result into just it's prime factors and then bringing all the necessary 2's and 5's together gave me the answer.
This was pretty interesting since I've never seen that pattern before. Though I really only went with my gut and some examples with the pascal's triangle thing. I didn't prove or know it would actually work. So I'll take the word of the video that it was, at least probably, right and prove it later.
Good riddle, but the question is frivolous. Just pull the dam lever!
If i were there, i've just pulled the Emergency Shut Down Lever in the first place.
I still have one question: who's this narrator? He narrates almost all Ted Ed videos, yet I don't know his name. Does someone else know? 🤔
Henk de UA-camsteen he’s credited as Addison Anderson
@@jessl6523 aha I see, thanks!
I'm pretty sure that is the fabled Ted himself.
I know his name ... Ted ed
4:38
Kinda obvious
I’ve gotta say, I’ve been watching these all day and my favorite things are the quotes
I did it differently and actually wrote down some of the products, which are actually pretty simple, as we can observe a pattern, ending with the last cell having 8 x 7^7 x 6^21 x 5^35 x 4^35 x 3^21 x 2^7 x 1 rabbits. That gives me 35 as the highest power of the product. Now I'm not sure if this necessarily equals 35 zeros, but I'm definitely close to say it higher than 10^80.
*_Magicians have joined the chat_*
"Hare-raisingly close"
I see what you did there and I respect you for it.
Aha! Finally got one of TED-Ed's riddles done in time. Saved the world in just 2 minutes!
Me without thinking anything.
Pulls emergency shutdown lever
Instead of wasting time calculating in head you can also just pull the damn lever. It is a emergency after all.
They have the best animations on UA-cam... I can never solve these and only watch to see the answer😂😂😂
"You may not use a calculator"
"I was never the one to play by the rules"
This is exactly why Doofenshmirtz has a self destruct button
2:09 sure, there isn’t enough time to calculate the exact number of rabbits in the final cell
All you have to know is how to pull a lever😎
These riddles clearly have effort put into them, and they're still pretty enjoyable to this day, but I can't help but miss the old days of Ted-Ed, when riddles were based purely on logic and strategic thinking as opposed to mathematics like this one. Those were insanely fun to watch and figure out. I'd love to see more of them in the future!
Coward.
The Buffy quote in the beginning was everything
“Should you pull the emergency-”
Why is that even a question? Sabotage is a severe problem!
Me: Huh, nano rabbits? looks cute
*pets nano rabbits*
Me: Hey where did my nano rabbit go? I want a refund!!
The sneaky Ted Ed animators hid something at 4:17
???
what?
Wait i'm really confused Could someone please tell me what it is?
@@shreyaraman6664 the "got 'em" hand
Loot at the hand of the man.
BRUH
I immediately thought of Pascal's Triangle. I didn't know how it would be applied, but I knew it was going to come up.
"Pull the lever Kronk!"
*Pulls the lever that boosts the reproduction*
"Wrong LEEEEEEVVVVVVEEERRRR!!!!"
Why do we even HAVE that lever?
my cousin said at 1:16 "omg hes t-posing" I actually cried
0:16 *RIP fallen rabbit*
Aww that's the cutest apocalypse ever
Pull the emergency lever!
But sir, the riddle!
Just do it!
Idk why I kept watching when I knew within 30 seconds just clicking on this video was a mistake.
I solved this quite similarly. Using the Prime Factorization Theorem, factors of 10 (a "zero") must be formed by 5*2. Looking at the starting row, it's clear there are more factors of 2 than 5, so we just count the number of factors of 5. Using Pascal's triangle gets us to 35. The number of factors of 2 are much higher, and therefore we don't need to count those.
The way I did this was by keeping the numbers in terms of powers from the original row.
I ended up with (1 * 2^7 * 3^21 * 4^35 * 5^35 * 6^21 * 7^7 * 8), and then from there I noticed that you could make 10 35 times.
I watch ted ed riddles just to see what strange creature they see me as each time
1:07
Soaring! Flying! There's not a star in heaven that we can't reach!
0:26 "The first cell has one rabbit, the second has two, and so on"
Me: "Wait, so the third will have 4 like in the power series, or 3 like in Fibbonacci?"
0:30: "with eight rabbits in the last one"
Me: "Aaa..."
"Boss! Someone hacked our codes and we cant use our calculators!"
*"Ok, pulls the lever 1 second after hearing the news"*
Is the short answer for this
There’s an emergency shutdown lever? Ok I’ll pull that.
YES! Finally a TED-Ed riddle I was able to solve! Was smiling the whole time writing digits from the Pascal's Triangle.
Who actually came up with these riddles???
This one was created by one of our awesome educators, Alex Gendler!
TED-Ed there are too hard
@@TEDEd Why would the scientist, upon hearing of the virus, not just instantly pull the stop lever?
I took the total amount of nano rabbits possible in the cell which it was 1x10^80 and took the power and substracted 46 out of 80 and got 34. I was amazingly close!
You said we have few minutes. And your are now figuring out the patterns with full chill😂😂😂😂
I would just give up, not even try, and just pull the freaking emergency lever. Who cares if it would’ve worked or not?
Ted Ed: "You have to stop the nano rabbits from taking over the world!"
Me, a crazy bunny lady: "I, for one, welcome our teeny bun-bun overlords."
Wut if you step on one :o
So this is how the great rabbit came to be in Re Zero
My guy just stood still studying the Pascal's triangle instead of pulling the emergency lever immediately
This is just a math problem, not a riddle.
Welcome to ted ed
2:02
*Reads rules and details 1-7*
Well those shouldnt be a problem
*Sees 8*
.....
Step 1: confirm that you have green eyes.
Setp 2: kindly ask for the werewolf to eat the antidote.
4:23 i get it HARE rasing
Did he just kill all those rabbits?
The hardest choices require the strongest wills.
He stopped reproduction and maturity, my parents wish they could do that XD
Yes, he needed to avoid a harey situation.
1:27 nano cats
Meow
I figured out an alternative method to solving this:
Knowing that the maximum capacity of the last cell is 10^80, and knowing that the number of nano-rabbits in each cell increases with each layer they go down, then all you need to do is divide the 10^80 upwards, to make sure the number remains small enough.
At 10^80, you split it into the two boxes above it: 10^40.
At 10^40, you do the same, splitting it into 10^20 for the row above.
If you continue this process, at the very top row you get 10^0.75.
This is less than 10, specifically, its less than 8.
This means that the last box with 8 nano-rabbits would cause the bottom box overflow, and you should pull the lever.
"hare-raisingly close" hahaha