Question

First term of ap is 5 and common difference 2. find the sum of n terms

Answer 1

`a_(n)` = 2n + 3

Explanation:

the sum to n terms of an AP is

`a_(n)` = a₁ + d(n - 1)

where a₁ is the first term and d the common difference

here a₁ = 5 and d = 2 , then

`a_(n)` = 5 + 2(n - 1) = 5 + 2n - 2 = 2n + 3