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C2-4 / (c0-4 + c1-4 + c2-4 + c3-4 + c4-4)=6 / (1+4+6+4+1)=3/8

whiskers(加菲猫)
(#364663@0)
Last Updated: 2002-2-10
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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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