(i)[3]
If the series is an arithmetic progression, calculate the sum of the first $80$ terms.
(ii)[2]
If the series is a geometric progression, calculate the sum to infinity.
Mathematics 9709 · AS & A Level · Series
Series — practice question
The series has first term $6$ and second term $2$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct application of the arithmetic series formula $S_n=\frac{n}{2}[2a+(n-1)d]$” …
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