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When randomly selecting four different integers from 1 to 9, inclusive, the probability that 1, 2, 3 and 4 are selected in the above order is x, while the probability that 1,2 3 and 4 are selected no matter in what order is y. What is the ratio of x to y?
Give your answer as a fraction.
Give your answer as a fraction.
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· 相关考点
6.4.1 古典概率
6.4.1 古典概率
以上解析由 考满分老师提供。
