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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)
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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