Poisson distribution is a commonly used discrete probability distributions, mathematical expectation of the Poisson distribution for m the distribution function defined as follows: P (m, k) = mk* em/k! (K = 0, 1, 2, 3 , ...) for a given m and k (0 <m<2000, 0<= k < 2500)，计算其概率，以科学格式输出，保留小数点后6位有效数字。

poisson.c

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