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A team of two students from an art school is to be selected to represent the school at a national event. The two students will be selected from the students in three classes that have no students in common. The three classes have 10 students, 8 students, and 7 students. If the two students must be selected from different classes, how many teams are possible?
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· 相关考点
6.3.2 乘法原理
6.3.2 乘法原理
以上解析由 考满分老师提供。
