<PRE><B>Question 769234</B>
The set A union B has 26 elements. Set A contains 15 elements, and set B contains 17 elements. How many elements are in A intersect B?
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(A and B) = A + B - (A or B)
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(A and B) = 15 + 17 - 26
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(A and B) = 9
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Cheers,
Stan H.</PRE>