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标题: 求助？？ [打印本页]

作者: insonbia13 时间: 2006-2-23 07:28 标题: 求助？？

set A,B,C have soem 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.

the answer is A. why?

作者: recently 时间: 2006-2-23 13:15

条件（1）不就给出了ABC共有的9个元素吗

作者: insonbia13 时间: 2006-2-28 20:13

I got it ,thanks !!!!

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