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Math Help - Infinite series

  1. #1
    Senior Member mollymcf2009's Avatar
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    Infinite series

    Assume the nth partial sum of the series \sum^{\infty}_{n=1} a_n is the following:

    s_n: 2-n3^{-n}

    a) Find a_n (n>1)

    a_n = ?
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  2. #2
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    a_n = s_n - s_{n-1}
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