题目来源
题目来源1 : 2020年GRE数学新800题
正确率：66%
难度：4
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If a pair of different cities is chosen at random from the seven cities, which of the following is closest to the probability that in the pair chosen, the city with the higher maximum temperature is also the city with the lower minimal temperature?
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以上解析由 考满分老师提供。
