The sum of the first 5 terms of an arithmetic progression is 40 and the sum of the…

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

The sum of the first 5 terms of an arithmetic progression is 40 and the sum of the first 8 terms is 104. What is its common difference? (a)

4

(b)

\dfrac{8}{3}

(c)

\dfrac{10}{3}

(d)

\dfrac{5}{3}