some elements in common

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some elements in common

by sanju09 » Wed Apr 08, 2009 5:07 am
Set A, B, 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 A
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Source: — Data Sufficiency |