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Question

Let n(U)=700, n(A)=200, n(B)=300 and n(AB)=100, Then n(ACBC)=

A
100
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B
300
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C
500
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D
450
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Solution

The correct option is B 300
n(ACBC)=n((AB)C)=n(U)n(AB)
=700[200+300100]
=300

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