请教各位，怎么都算不出来，脑子短路了呀

bhchka · 发表于 2011-7-13 12:53:29

In a certain board game, a stack of 48 cards, 8 of which represent shares of stock, are shuffled and then placed face down. if the first 2cards selected do not represent shares of stock, what is the probability that the third card selected will represent a share of stock?(答案是4/23）

rukawasherry · 发表于 2011-7-13 13:14:16

1*（48-2分之8）吧个人认为前两张card已经是既定的事实了概率是1

bhchka · 发表于 2011-7-13 14:37:38

请教各位，怎么都算不出来，脑子短路了呀

所属分类: GMAT考试

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