Formule

$ P(X = k) = \frac{{\left( {\begin{array}{*{20}c} M \\ k \\ \end{array}} \right)\left( {\begin{array}{*{20}c} {N - M} \\ {n - k} \\ \end{array}} \right)}}{{\left( {\begin{array}{*{20}c} N \\ n \\ \end{array}} \right)}} $
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