If A and B are two finite sets,then prove that n(A union B )= n(A)+n(B)-n( A intertsection B)

If A and B are two finite sets,then prove that n(A union B )= n(A)+n(B

1.	If A and B are two finite sets,then prove that n(A union B )= n(A)+n(B)-n( A intertsection B)
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