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Question

A and B are two finite sets such that n(A)=m1 and n(B)=m2, then find the least and greatest values of n(AB).

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Solution

n(AB)=n(A)+n(b)n(AB)
Max Value =m1+m2 When n(AB)=0 that is there is no same element in A and B .
Assuming m1m2
Min value =m1 when n(AB)=m2
Assuming m1m2
Min value =m2 when n(AB)=m1

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