1.

If n(A)=20, n(B)=30,n(A interset B)=10, find n(A' interset B')

Answer»

We KNOW that n (A UNION B)=n (A)
+n (B)-n (A INTERSECT B)
=20+30-10
=50-10
=40
So n (A union B) is 40


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