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There are 210 students in a class. 160 of them take physics, 80 of them take chemistry, and 60 of them take biology. Each student has to take at least one courses. but cannot take all the three classes simultaneously. The number of students who take two classes is what percent of all the students?
Give your answer as a fraction.
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· 相关考点
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。
