The sum to infinity of a convergent geometric progression is and the sum of its first…

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

Problem

The sum to infinity of a convergent geometric progression is

48

and the sum of its first three terms is

42

. Find the first term

a

of the progression. (a)

18

(b)

36

(c)

24

(d)

12