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Question

For any two sets A & B;n(A)=4,n(B)=7,n(AΔB)=3, then, n(AB)=

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Solution

Given n(A)=4,n(B)=7,n(AΔB)=3
We know the formula, i.e.,
n(AΔB)=n(A)+n(B)2n(AB).
3=4+72n(AB)
n(AB)=4+732=4.


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