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标题: [求助]GWD 24-4，谢谢。 [打印本页]

作者: bipedalisms 时间: 2006-4-24 04:29 标题: [求助]GWD 24-4，谢谢。

4 A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black-and-white set?

1/7 B. ? C. 5/14 D. 11/28 E. 13/26
大家看看那个是正确答案，我怎么找不到阿. 谢谢。

作者: observer 时间: 2006-4-25 06:25

我认为是[C（8，2）-C（6，2）]/C（8，2）=13/28

找不到对应选项

作者: bipedalisms 时间: 2006-4-26 06:50

谢谢！我的答案和你的一样。

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