Question

Evaluate the sum
A. 306
B. 240
C. 360
D. 272

Answer 1

Option D.
`272`

Explanation:

we know that

To evaluate the sum , use the formula

`S=(1)/(2)(a1+an)n`

where

a1 is the first term

an is the last term

n is the number of terms

In this problem

For n=1 ------> a1=2(1)=2

For n=16 ------> an=2(16)=32

n=16 terms

substitute in the formula

`S=(1)/(2)(2+32)16`

`S=272`