The first term of an AP is

MATHEMATICS · Single correct · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

8

. The sum of its first 30 terms equals 15 times its 20th term. What is the common difference of the AP? (a)

0.8

(b)

-0.4

(c)

-0.8

(d)

-\dfrac{8}{11}