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Official Specimen Paper 1 · Q19

Paper 1Sequences & series

A geometric series has first term 4 and common ratio rr, where 0<r<10<r<1.

The first, second, and fourth terms of this geometric series form three successive terms of an arithmetic series.

The sum to infinity of the geometric series is

A12(5−1)\frac12(\sqrt5-1)
B2(3−5)2(3-\sqrt5)
C2(1+5)2(1+\sqrt5)
D2(3+5)2(3+\sqrt5)

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