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没有男孩和4个男孩的概率:(1/2)**4+(1/2)**4;1个男孩3个女孩和1个女孩3个男孩的概率:4*(1/2)**4+4*(1/2)**4。因此2个男孩和2个女孩的概率是:1-1/8-1/2=3/8

bluelamp (蓝灯)
(#364584@0)
2002-2-10 -04:00
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Back To Topic: GMAT题,一对夫妇生了4个小孩,问2男2女的概率是多少?我的答案是1/5,但友人说是3/8。

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