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.
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2008-8-13 22:32:00
楼主