1. A shipment of 8 television setscontains 2 black-and-white sets and 6 color sets, if 2 television sets are tobe chosen at random from this shipment, what is the probability that at least 1of the 2 sets chosen will be a black and white set? 概率，烦请列出公式。
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发表于 2011-9-3 23:16:58
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