It is given by:
$$
P\{X=k\} = \frac{{C(M, k) \cdot C(N-M, n-k)}}{{C(N, n)}}
$$
where $C(a, b)$ denotes the number of combinations of $a$ items taken $b$ at a time, $N$ is the total number of items, $M$ is the total number of success states, $n$ is the number of
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