NN HELP one math prep question, haven't found the explaination yet

shanefeng · 发表于 2009-12-14 10:06:21

17. 2311-!-item-!-187;#058&002635
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

I don't even understand what the question talks about.

lcgodd · 发表于 2009-12-14 10:16:47

简单来说就是48张牌里面有8张特别的牌，如果前两次抽到了普通牌，问第三次抽到特殊牌的机会有多大。
也就是8/（48-2）=8/46=4/23,答案是e

shanefeng · 发表于 2009-12-14 10:25:54

got it, thank you so much

NN HELP one math prep question, haven't found the explaination yet

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