斑竹可以算算邻居两个小孩至少有一个是男孩两个都是男孩的概率是多少

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送交者: HunHunSheng 于 2008-03-03, 15:38:44:

回答: 生物系得不会那么复杂而且估计狗熊掰棒子学完了就忘 由 HunHunSheng 于 2008-03-03, 15:34:08:

Solution one:

One is a boy. So the other child has 50% of chance to be also a boy. So the answer is 50%


Solution two:

BB, BG, GB, GG each is equally liekly so each is 25%.

Prob(BB|BB,BG,GB)=1/3.

How come you can have two different answers?




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