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Math Help - binomial theorem

  1. #1
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    binomial theorem

    if a(n)=sigma lower notation(r=0) and upper notation(n) expression to be summated (1/(nCr) then same sigma but expression to be summated (r/(nCr) equals ?? for first
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    Quote Originally Posted by prasum View Post
    if a(n)=sigma lower notation(r=0) and upper notation(n) expression to be summated (1/(nCr) then same sigma but expression to be summated (r/(nCr) equals
    I hope this helps.

    a_n  = \sum\limits_{r = 0}^n {\dbinom{n}{r}^{-1}}=\sum\limits_{r = 0}^n {\dfrac{r!(n-r)!}{n!}}
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