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Math Help - Complicated algebra terms

  1. #1
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    Aug 2009
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    Question Complicated algebra terms

    This is a little complicated, i'll try to explain as best i can.

    Say I have n different numbers, z\sb{1}, z\sb{2}, ... , z\sb{n}
    I wish to find the summation of every possible way of multiplying x different numbers together.

    For clarification: if n=3, x=2 I would want:
    z\sb{1}z\sb{2} + z\sb{1}z\sb{3}  + z\sb{2}z\sb{3}
    If n=4, x=3 i would want:
    z\sb{1}z\sb{2}z\sb{3} + z\sb{1}z\sb{2}z\sb{4} + z\sb{1}z\sb{3}z\sb{4} + z\sb{2}z\sb{3}z\sb{4}

    Basically, I just need a function F(x,z\sb{1},z\sb{2}, ... ,z\sb{n}) that gives this result.
    Last edited by TweedyTL; November 4th 2009 at 11:13 AM.
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  2. #2
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    Oct 2009
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    Possible answer

    Check for combinations under number theory.
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