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标题: GWD1 Q-37 [打印本页]

作者: linglingdang 时间: 2009-7-13 07:26 标题: GWD1 Q-37

Q37:

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?

A. 3/64

B. 1/20

C. 1/16

D. 1/12

E. 1/8

答案是B,请大家帮忙解题. 谢谢了.

作者: wumeier 时间: 2009-7-13 21:30

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

作者: rheazhang 时间: 2009-7-17 22:12

p(4 1)*p(3 1)/ p (16 2)= 1/20

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