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一共有:0个男孩,1,2,3,4个男孩,共5种可能,2个男孩是之中一种,所以是1/5。 对吗?

eglington (eglington)
(#364583@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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