Mathematics 9709 · AS & A Level · Series

Series — practice question

The fifth, sixth, and seventh terms in a geometric progression are $8k$, $-12$, and $2k$ respectively.
(main)[4]

If $k$ is negative, determine the sum to infinity of the progression.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Setting up the equation $(-12)^2=8k\times2k$” …

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