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Find n and Sn of a = 5 , d=3 An=50.

Posted by Thakur Naresh Rana 6 years, 10 months ago

CBSE > Class 10 > Mathematics

7 answers

Disha Patidar 6 years, 10 months ago

First apply the formula an=a+(n-1)d an=50, a=5 ,d=3. 50=5+(n-1)3 50-5=(n-1)3 45=(n-1)3 45÷3=(n-1) 15=(n-1) 15+1=n 16=n Now, apply Sn=n/2 (2a+(n-1)d Sn=16/2 (2×5+(16-1)3 Sn=8 (10+45) Sn=8×55 Sn=440 Therefore, n=16 and Sn=440 ☺☺

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Anjeela Khan?? 6 years, 10 months ago

N=60 Sn= 440

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Amaan Siddiqui 6 years, 10 months ago

an=a+(n_1)d

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Anushka Jugran❣️ 6 years, 10 months ago

Firstly apply the formula an =a+(n-1) d and then apply the formula to find sum that is sum equal to n/2(2a+(n-1)d)

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Jatt Putt Aryan???? 6 years, 10 months ago

Sorry sorry n= 16 and sn=440

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Jatt Putt Aryan???? 6 years, 10 months ago

N=12 and sn = 258

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Puja Sahoo? 6 years, 10 months ago

n=16, and Sn= 440

2Thank You

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