我没看。根据贝叶斯公式


所有跟贴·加跟贴·新语丝读书论坛

送交者: Amsel 于 2008-07-31, 23:14:45:

回答: 这个问题还真的在维基百科上 (Boy or Girl paradox) 由 HunHunSheng 于 2008-07-31, 23:08:11:

P(twice boy|two boys) = 1
P(twice boy|(older girl and younger boy)) = 0.25
P(twice boy|(older boy and younger girl)) = 0.25
P(twice boy|two girls) = 0

So P(two boys|twice boys) = P(two boys) * P(twice boy|two boys)/(0.25*( P(twice boy|two boys) + P(twice boy|(older girl and younger boy)) + P(twice boy|(older boy and younger girl)))) = 1/3.




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