prep2-12

paulstars · 发表于 2008-8-15 17:25:00

Sets A, B, and C have some elements in common. If 16 elements are in both A and B, 17 elements are in both A and C, and 18 elements are in both B and C, how many elements do all three of the sets A, B, and C have in common?
(1) Of the 16 elements that are in both A and B, 9 elements are also in C.
(2) A has 25 elements, B has 30 elements, and C has 35 elements.

OA是A，我认为是D

不知道这个题目tricky在哪

谢谢

paulstars · 发表于 2008-8-16 08:41:00

顶一下

水流云去 · 发表于 2008-8-16 12:20:00

这个题目 2）推不出啊，知道 A、 B 、C各有多少，但是三个都有的element相关信息没有。。

paulstars · 发表于 2008-8-16 13:13:00

头脑一下子短路，明白了，没有总人数

prep2-12

prep2-12

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