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? A.1/7 B. ¼ C. 5/14 D. 11/28 E. 13/26
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发表于 2010-8-7 11:36:08
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