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答案是3/8 这样算:生两个男孩的可能总共有C2-4=6中可能。生四个孩子,不考虑性别的话,总共有2×2×2×2=16种可能,所以,生俩男俩女的概率是6/16=3/8.

npu (喝点酒就醉)
(#364689@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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