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Dr. Mosher call the roll ten days in a row. If Candy attended 8 times, Sam attended 7 times, and Amy attended 6 times. If they show in class simultaneously in only one day, and at least 1 student attend each day`s course, how many days in which exactly two of them attended?
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6.1.5 三集合问题
6.1.5 三集合问题
以上解析由 考满分老师提供。
