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Three students need to read 50 proposals. Each proposal has to be read by at least one student. Student A read 38 of them, Student B read 36 of them, while Student C read 28 of them. At least how many proposals are read by at least two students?
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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。
