:: C 2-4 / P 2-4 = 6/ (4x4) = 3/8, p 2-4 means all the possibilities that randomly choose 2 children of four.

ondway (一枫家新)
(#364960@0)
2002-2-10 -05:00

回到话题: 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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