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Re:结果是算出来了,可为什么是这么简单的结果?

Posted by huanmeng at 2010-07-26 19:58:24 on Problem 3716
In Reply To: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
> 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。
你搞出了那个简单公式?··指点下呀怎么推出来的··

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