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Question

If A and B are two disjoint sets, then n(AB) is equal to 



A

n(A)+n(B)

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B

n(A)+n(B)n(AB)

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C

n(A)+n(B)+n(AB)

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D

n(A)  n(B)

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Solution

The correct option is B

n(A)+n(B)


Two sets are disjoint if they do not have a common element in them , i.e., AB=ϕ

n(AB)=n(A)+n(B)


Mathematics
RD Sharma
Standard XI

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