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答案：
E
（1）Drama
（2）music；20个中有10个是男生
单独1 2 都没有考虑剩下一个club的情况，所以是求不出来总体男生比例的
联立：我们要考虑的是有的学生是两个club都占的，而这样一部分的男生人数并未告知，所以也不充分
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