Posted by **keke** on Friday, August 10, 2012 at 3:46pm.

If the universal set U is defined by

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and

A = {1, 2, 3, 4 }

B = {3, 4, 5, 6, 7}

What is n(A ∩ B) ?

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