我的问题的关键是在真实生活里不可能抽象的获得"两个孩子至少有一个是男孩"这种信息


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送交者: HunHunSheng 于 2008-07-16, 11:21:49:

http://www.xys.org/forum/db/3/188/41.html

Using my example, If DuanJiang heard a boy's voice in backgroudn noises, that means the probablity of having a girl is reduced, otherwise how come he did not hear
a girl's voice?

The answer is the probablity that the guy has two sons is 0.5 not 1/3.




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