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Sets A, B and C have some elements in common. If 16 elements [#permalink]
26 Oct 2005, 21:08
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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 15 elements, B has 30 elements and C has 35 elements.