The sum of the first terms of an arithmetic progression is and its first term is

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

Problem

The sum of the first

20

terms of an arithmetic progression is

670

and its first term is

5

. What is the common difference of the progression? (a)

-3

(b)

\dfrac{62}{19}

(c)

3

(d)

2