Math, asked by Elwyngg, 5 months ago

for an AP S8=64 and S19=361 find Sn

Answers

Answered by sohanilaskar2009

0

Answer:

S8=64

Sn=2n(2a+(n−1)d)

2a+7d=16

S19=361

2a+18d=38

Solving, a=1,d=2

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