Question

How do you find the sum of the arithmetic series of `a_1=5`, `a_n=29`, n=11?

Answer 1

The sum is `187`.

Explanation:

Use the formula `s_n = n/2(t_1 + t_n)`.

`s_11 = 11/2(5 + 29)`

`s_11 = 11 xx 17`

`s_11 = 187`

Hopefully this helps!