题库搜索>问题求解PS-13389
Of the 32 students in a certain class, 15 are in a music club and 20 are in a dance club. If 10 of the students are not in either club, how many of the students are in only one of the two clubs?
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要么一个club,要么both的人数：32-10=22
Both的：15+20-22=13
所以只在其中一个俱乐部的是：22-13=9
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