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Fred receives $$40$$ channels, numbered with the integers from $$1$$ to $$40$$, on his television set. If he is to select a channel randomly, what is the probability that the channel number will be divisible by $$4$$ or $$5$$ or both?
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· 相关考点
1.6.4 倍数的个数
以上解析由 考满分老师提供。
