原题是这样的吗?那就不是古典概率问题。概率肯定在1/2以上。


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送交者: Amsel 于 2008-07-31, 22:42:50:

回答: 湘女一看也就是一个概率盲居然凭感觉得出了2/3 由 HunHunSheng 于 2008-07-31, 21:22:51:

A person has two children. You do not know they are sons or daughters.

Scenario 1: One day he brings a boy to visit you and introduce the boy to you as his son。

Scenario 2: One day you make a phone call to him and he said only he and his two children are at home. You hear some boy's voice among backgroudn noise.




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