操作系统实现的一种阻塞队列~

$$ \begin{array}{c} S= \binom{N}{n},A_{k}=\binom{M}{k}\cdot \binom{N-M}{n-k} \\ P\left ( A_{k}\right ) = \frac{\binom{M}{k}\cdot \binom{N-M}{n-k}}{\binom{N}{n}} \end{array} $$

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