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题目内容
If an integer is chosen at random from the integers between 101 and 550, inclusive, what is the probability that the chosen integer will begin with the digit 1, 2 or 3, and end with the digit 4, 5, or 6?
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· 相关考点
6.3.1 计数原理
6.3.1 计数原理
以上解析由 考满分老师提供。