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有公式的:C2-4 / (C1-2 * C1-2 * C1-2 * C1-2 ) ---- C2-4是上2下4,没法写公式,真麻烦,呵呵 :-))

flying_snow (飞雪浮冰)
(#364588@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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