If A and B are finite sets such that n(A) = m1 and n(B) = m2 ,then find the least and the greatest values of n(A U B).
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The least value of n(AUB) will be x or y. It depends which set is bigger.
if x > y. Then least value of n(AUB) will be x if all elements of B are already contained as a subset of A. [ie B ⊂ A]
The greatest value is x + y. if A and B are disjoint sets. (ie A ⋂ B = ϕ)
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