请教大家 PREP-DS2-132

132.      14175-!-item-!-187;#058&010326

If the drama club and music
club are combined, what percent of the combined membership will be male?

(1)  Of the 16 members of the drama club, 15 are
male.
                

(2)  Of the 20 members of the music club, 10 are
male.

答案居然是 E. 

真的怀疑我的脑袋是不是进水了。。。

谢谢指教！

怎么会是E？？？

完了，要考试了，结果看一个不会一个，看一个错一个。。。

以下是引用Kate_zhou在2008-12-25 11:48:00的发言：
我觉得是要考虑两个club的有交集。

the same feel

math is considered the same logic error as the CR. hehe

must rule out other possible factors