Question

if A has 3 element and B has 6 element,then the minimum and maximum number of the element in AUB are respectively
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Answer 1

Answer:

Maximum number of elements in (A∪B)=9 . Case 2 From (i) , it is clear that n(A∪B) will be minimum when n(A∩B)=0. maximum ,i.e, when n(A∩B)=3. In this case, n(A∪B)=n(A)+n(B)-n(A∩B)=(3+6-3)=6.