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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！ |
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