Mathematics 9709 · AS & A Level · Series

Series — practice question

(main)[6]

For a geometric progression, the combined value of the 1st and 2nd terms is $50$, and the combined value of the 2nd and 3rd terms is $30$. Determine the sum to infinity.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Sets up $a(1+r)=50$ or $\frac{a(1-r^2)}{1-r}=50$” …

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