1 - \frac{(N-k)!/(N-k-r)!}{N!/(N-r)!} where N = 10000.0, k = 100, r = 31 - \frac{(N-k)!/(N-k-r)!}{N!/(N-r)!} where N = 10000.0, k = 100, r = 3

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