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Among the 300 students who sign up for a course, 9% are sophomore, 3% are junior and 1% is senior. If a teacher randomly selects 3 students form them, then how many different combinations of a sophomore student, a junior student and a senior student will be there?
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6.2.2 等比数列
6.2.2 等比数列
以上解析由 考满分老师提供。
