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类似于几何分布,只要在几何分布的结果上乘一个k就可以了

Posted by yygy at 2014-04-01 16:42:30 on Problem 3682
E[n]=k/p
D[n]=k*(1-p)/(p*p)
E[n*n]=D[n]+E[n]*E[n]

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