Question

What is the Sum of the terms of the series 6 + 9 + 12 + . . . + 30

A. 144

B. 180

C. 162

Answer 1

We are adding 3 each term until 30.
So, we are adding:
6+9+12+15+18+21+24+27+30
15+27+39+51+30
42+90+30
132+30
162
So, C. 162.