What is the relation between n(A),n(B),n(A union B),n(A intersection B).
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n (A U B) = n (A) + n (B) - n (A ∩ B) - Here, the union of A & B is equal to the sum of elements of A and elements of B and then subtracting the intersection of A & B from it. - Intersection is subtracted so that the elements which are common to both A and B should not repeat
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