Question 89

What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

Solution

$$S_{n} = \frac{n}{2}(a+l)$$

$$S_{9} = \frac{9}{2}(7+55) = 279$$

So the answer is option D.

Share on Whatsapp Share on Whatsapp

Create a FREE account and get:

Free SSC Study Material - 18000 Questions
230+ SSC previous papers with solutions PDF
100+ SSC Online Tests for Free

Follow us on

Boost your Prep!

Download App