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added 3 characters in body

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edited Feb 7, 2016 at 8:10

This is mechanized in Maple:

binomial(m+n, n)*(sum(binomial(m, k)n(-1)^k/(n+k), k = 0 .. m))

binomial(m+n, n)*(sum(binomial(m, k)*n*(-1)^k/(n+k), k = 0 .. m));

$${\frac {{m+n\choose n}}{{m+n\choose m}}}$$ PS. Please, don't change my answer.

This is mechanized in Maple:

binomial(m+n, n)*(sum(binomial(m, k)n(-1)^k/(n+k), k = 0 .. m))

$${\frac {{m+n\choose n}}{{m+n\choose m}}}$$

This is mechanized in Maple:

binomial(m+n, n)*(sum(binomial(m, k)*n*(-1)^k/(n+k), k = 0 .. m));

$${\frac {{m+n\choose n}}{{m+n\choose m}}}$$ PS. Please, don't change my answer.

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created Jan 10, 2015 at 16:52

This is mechanized in Maple:

binomial(m+n, n)*(sum(binomial(m, k)n(-1)^k/(n+k), k = 0 .. m))

$${\frac {{m+n\choose n}}{{m+n\choose m}}}$$