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还是不明白，如此说来，4张牌（2红2黑）抽出1红1黑的概率是2/3，可是我怎么也排不出来啊
beware
(断线风筝)
(#143929@0)
Last Updated: 2001-7-25
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据说是M$的面食题@@ 看看有没有人做的出来@@
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