Question

nth term in ap is 2n+1 then find sn

Answer 1

HERE IS THE ANS

An = 2n+1

at n=1

A1 = 3= a

similarly :-

A2 = 4

common difference = 4-3 = 1

An = a+ (n-1)d

2n+1 = 3 + (n-1)

n = 1

Sn = n/2(a+An)

Sn = 1/2(3+2n+1)

Sn = n+2 ans.

hope it helps you

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Answer 2

Hence

here your Answer user.