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Official 2021 Paper 1 · Q3

Paper 1Sequences & series

An arithmetic progression and a convergent geometric progression each have first term 12\frac12.

The sum of the second terms of the two progressions is 12\frac12.

The sum of the third terms of the two progressions is 18\frac18.

What is the sum to infinity of the geometric progression?

A−2-2
B−1-1
C−12-\frac12
D−13-\frac13
E13\frac13
F12\frac12
G11
H22

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