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专题8古典概型例1.从3,5,7,9中任取2个不同的数,则取出的2个数之差的绝对值大于3的概率是 A. B. C. D.例2.2020年在新冠疫情基本控制的情
专题8古典概型例1.从3,5,7,9中任取2个不同的数,则取出的2个数之差的绝对值大于3的概率是 A. B. C. D.【解析】解:根据题意,从3,5,7,9
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