Question

What is the sum of a 24–term arithmetic sequence where the first term is 12 and the last term is 219?

Answer 1

Sum `=2772`

Explanation:

Given `n=24 , a_1=12, a_24=219`

Formula for Sum of Arithmetic Sequence:

`S_n=n/2(a_1+a_n)`

`S_24=24/2(12+219)`

`S_24=12(231)`

`S_24=2772`