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你的说法不正确在于，你的理论基于生0，1，2，3，4个男孩的概率相等，似乎正确但实不正确，应该基于生男生女概率相等！
naughtypig
(皮皮猪爱玩现在不敢)
(#364603@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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