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标题: 天山6－37 [打印本页]

作者: xirui2000 时间: 2005-11-1 07:11 标题: 天山6－37

37. A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow. If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?

我是这么算的对吗？（4*3）/ [C(16,2)*P(2,2)]

作者: luoye1 时间: 2005-11-1 12:48

(4/16)*(3/15)=1/20

作者: xirui2000 时间: 2005-11-3 19:07

thanks !!!

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