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25 November, 16:15

S=n (a1+an) / 2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?

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  1. 25 November, 17:18
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    S = n (a1 + an) / 2

    2S = n (a1 + an)

    2S = na1 + nan

    nan = 2S - na1

    an = (2S - n a1) / n
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