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标题: 求助PREP一道数学题！！！ [打印本页]

作者: shenyelaile 时间: 2011-8-13 09:14 标题: 求助PREP一道数学题！！！

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 2 cards selected do not represent shares of stock, what is the probability that the third card selected will represent a share of stock?

(A)1/8

(B)1/6

(C)1/5

(D)3/23

(E)4/23

大家帮帮忙给我讲讲这道题应该怎么算，我怎么也算不出答案来呢！

作者: EthanEthan 时间: 2011-8-14 07:52

这题选E吗？直接用那8张牌除以剩下的46张就行了吧？8/46=4/23

作者: zjhzkingsam 时间: 2011-8-17 20:25

是E吗？同问。我就怕排列组合和概率的题。

作者: shenyelaile 时间: 2011-8-18 06:19

答案是E，应该是这样算没错。谢啦！

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