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假设相交的概率是p，扔了n次

Posted by kicc at 2005-08-28 18:39:24
In Reply To:2598 match throwing game的718 Posted by:linghuchong at 2005-08-28 17:42:00 
相交k次的概率是
C(k,n) * p^k * (1-p)^(n-k)
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