The question is about students attending three clubs: swimming, coaching and archery the students who attend swimming also attend coaching. 16 attend coaching, 9 attend S and A, and 4 attend three clubs how many attend both clubs?
17
可是9 attend S andA, and 4 attend three clubs 参加了S的都参加了C，那9个参加S&A的应该就是参加了三个的呀？
难道这个9 attend S andA是指分别由9个参加了S，9个参加了A？可是这样答案就算不出来。。
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发表于 2009-7-1 09:14:00
