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Re:冠军至少做N题这个概率怎么求?

Posted by nhzp at 2004-12-28 12:01:08 on Problem 2151
In Reply To:Re:冠军至少做N题这个概率怎么求? Posted by:nhzp at 2004-12-28 12:00:19
> 
> 不是的,
这两个事件并不独立

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