binomial(n,k)
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When either n or k are not ZZ objects, the Gamma function is used, i.e., $\binom{n}{k} = \frac{\Gamma(n + 1)}{\Gamma(k + 1)\Gamma(n - k + 1)}$.
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A polynomial may also be used for n.
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The object binomial is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/binomial-doc.m2:36:0.