Mathematics 9709 · AS & A Level · Series

Series — practice question

In this arithmetic progression, the 13th term is $12$ and the total of the first $30$ terms is $-15$.
(main)[5]

Determine the sum of the first $50$ terms of the progression.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “This gives $a+12d=12$.” …

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