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LX你的方法又上升到数学理论中来了，顺便问一句，C2-4的计算方法是什么来着。。。。什么阶乘除以什么阶乘和什么来着？
naughtypig
(皮皮猪爱玩现在不敢)
(#364595@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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