If nth term of an ap is 2n+1 find the sum of first n terms

Answers (1)

Given that,

a(n) = 2n + 1.

To find the first term (a) Substitute "1" at the place of "n".

a(1) = 2(1) + 1

a = 3.

As we know that sum of n term

S = n/2(a+l)

 

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