Mathematics 9709 · AS & A Level · Series

Series — practice question

The total of the first 20 terms in an arithmetic progression is $405$, while the total of the first 40 terms is $1410$.
(main)[5]

Find the 60th term in the progression.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Accurate equation $10(2a+19d)=405$” …

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