First we want to find (n) So, an=a+(n-1)d 43=1+(n-1)3 43=1+3n-3 43=3n-2 43+2=3n 45=3n 45/3= n 15=n We got n=15 Now find Sn Sn=n/2×(a+an) Sn=15/2×(1+43) Sn=15/2×44 Sn =15×22 Therefore, Sn=330👍🏻
sir seeing ur class at 12:28 am in uae bcoz tmw exam hehe🥲 reallyy helped lot sir🤗🥰 *sir one request*-> pls come in our lives once. Ur thugs are too grt though u say it bcoz of anger its soo poli.
The sum has given in the question Its 78 The AP is 24,21,18....... we have to find 'n' So for it We will use Sn formula • Sn = n/2 ( 2a +[ n - 1 ] d) •a = 24 { first number of the AP} •d = -3 {got by subtracting the second number with the first number} Now , we will substitute the values we got with the formula •78 = n/2 ( 2×24 + [ n - 1 ] -3 ) Then, •78 = n/2 ( 48 + [ n - 1 ] -3 ) { We will multiply -3 with n - 1 } •78 = n/2 ( 48 - 3n +3 ) •78 × 2 = n ( 51 - 3n ) {We will add 48 with 3 to get 51 and we will multiply 78 with 2 which was with n } •156 = 51n - 3n2 {We will multiply n with 51- 3n , don't get confused after seeing 3n2 it got squared only} •3n2 - 51n +156 = 0 Now we will divide this equation by 3 so we will get , •n2 - 17n + 52 = 0 Now we will use the splitting the middle term formula • n2 - 13n - 4n + 52 = 0 • n ( n - 13 ) - 4 ( n - 13 ) = 0 • ( n - 4 ) ( n - 13 ) = 0 • n = 4 or n = 13 So the answer is 4 or 13 This is how I did , hope you will understand.
All the best for your exam tomorrow
Thanks
Suck
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Any 2025......
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13:59 n=15
Sn=330
sn 330 engane vanu en paranj tharamo
First we want to find (n)
So,
an=a+(n-1)d
43=1+(n-1)3
43=1+3n-3
43=3n-2
43+2=3n
45=3n
45/3= n
15=n
We got n=15
Now find Sn
Sn=n/2×(a+an)
Sn=15/2×(1+43)
Sn=15/2×44
Sn =15×22
Therefore,
Sn=330👍🏻
@@naveenn710 thanx ♥️
@@amegh9789 😌
Crct bro
n=15
Sn= 330
43=1+(n-1)3
43=1+3n-3
45=3n
n=15
Sn= 15/2 (2+14*3)
Sn=15/2*44
Sn=15*22
Sn=330
Bro Sn = n/2 (a + an ) Mathiyayirunnu
Ath enganeyan 43 45 ayath🧐
Onn parayamo
@@alphx5001 Bro 43 = -2 + 3n enn akum! Ennit -2 LHSil kond varumbol ath +2 akum so => 43+2 =3n//
@@legentyt2779 ok thanks bro👍🙌
Ah 43 enganayan 42 ayath
2025>>>>>>>>>likr>>>>>>>>€
n = 15
Sn = 330
EXCELLENT class sir. THANK YOU
sir seeing ur class at 12:28 am in uae bcoz tmw exam hehe🥲
reallyy helped lot sir🤗🥰
*sir one request*-> pls come in our lives once. Ur thugs are too grt though u say it bcoz of anger its soo poli.
le me watching 5 h before exam lol😅
foooooooooooool
ans of 1,4,7.....,43
n=15
sn=330
i am not sure about this ans
I got n= 15 but sn=51
I got this 😊
n=15
sn=330 i got this
I got 330
kittiya way onn post cheyo
how did it become3 n square in the last question
330 14:08
Model exam anaale😅😅😅
Sn = 330
Me seeing it ai 2 am and tomorrow model exam
So what
Same here
😂😂😂
But am watching this in 7 am and today is my model exam 😅
Njn epolannu konune sathym parenjal onum manesilayila😢
Same here 😢😢😢
@@aaronosamuel9738eda Kalla ommanchaa
😂👍
Same here 😢
n=192/4+1 then n=49
Same ans i got👍🏻
I could not understand the last part at all sir 😢😢
😂
N=15
Sn=33
I am cooked 😢but sir saved me
Thank you sir
147..........43
Sir
. n=15
.sn=330 iam not sure
n =192/4 +1 =49
Sn = 33
Wait, how?
-156 engane varunne?
Thank you
Sooooo easy sir
16 : 24 explain cheyyavo arelum
The sum has given in the question
Its 78
The AP is 24,21,18.......
we have to find 'n'
So for it
We will use Sn formula
• Sn = n/2 ( 2a +[ n - 1 ] d)
•a = 24 { first number of the AP}
•d = -3 {got by subtracting the second number with the first number}
Now , we will substitute the values we got with the formula
•78 = n/2 ( 2×24 + [ n - 1 ] -3 )
Then,
•78 = n/2 ( 48 + [ n - 1 ] -3 )
{ We will multiply -3 with n - 1 }
•78 = n/2 ( 48 - 3n +3 )
•78 × 2 = n ( 51 - 3n )
{We will add 48 with 3 to get 51 and we will multiply 78 with 2 which was with n }
•156 = 51n - 3n2
{We will multiply n with 51- 3n , don't get confused after seeing 3n2 it got squared only}
•3n2 - 51n +156 = 0
Now we will divide this equation by 3
so we will get ,
•n2 - 17n + 52 = 0
Now we will use the splitting the middle term formula
• n2 - 13n - 4n + 52 = 0
• n ( n - 13 ) - 4 ( n - 13 ) = 0
• ( n - 4 ) ( n - 13 ) = 0
• n = 4 or n = 13
So the answer is 4 or 13
This is how I did , hope you will understand.
n is 15
Sn is 308
Any 2025 il
Anyone in 2024 september
330
11/6/25
❤
2752
Hi
n=17,Sn=374
Yaaa mone malayalam ayirunnooo
Exam winner❤️❤️❤️❤️,
Poo myre
unnumbered podia
No offence but ur lagging tooo much
Exam winner >>>>
Then why xylem 😼
@@Samproleplay99 ikka big fan of your game play 💗
Ohh mahn
Ath sheriyanu bro . Exam winner valare nallathan 😊
Exam winner is good but xylem is emotion💚💚
edak edak set analo en chothikalle nan set alla 😢
😂
thank q so much sir
Thank you sir
n=15,Sn=44
Sn = 330
Sn=330
Best classes sir .Thank you
n=15
Sn=330
N=15
Sn=375
Sn = 330
n=15 Sn=330
n=15
Sn=330
N=15
Sn=630
n=15
Sn=330
n= 15
Sn=330