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Given $S_n = S_{3n}$, can we express $a$ in terms of $n$?
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Ref: R9613

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An arithmetic progression has first term $a$ and common difference $-1$. The sum of the first $n$ terms is equal to the sum of the first $3n$ terms. Express $a$ in terms of $n$.

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Sequences

Given $S_n = S_{3n}$, can we express $a$ in terms of $n$? Add to your resource collection Remove from your resource collection Add notes to this resource View your notes for this resource

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Given $S_n = S_{3n}$, can we express $a$ in terms of $n$?
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