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结果是算出来了,可为什么是这么简单的结果?

Posted by dukang at 2009-12-12 16:49:36 on Problem 3716
很久没算过概率题了,花了一整天时间,才把公式搞对。
可是结果为什么竟是如此简单?还是搞不明白。

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