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Math Help - partial sums of sequences

  1. #1
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    partial sums of sequences

    find the Sn of An = 1/2^n
    Last edited by confusedgirl; March 2nd 2010 at 06:35 AM. Reason: i accidentally asked the same question
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  2. #2
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    geometric sum for a=\frac12 where \sum_{j=0}^na^j=\frac{a^{n+1}-1}{a-1}.
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