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Question

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

A
n(A)
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B
n(B)
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C
n(A)+n(B)
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D
n(A).n(B)
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Solution

The correct option is C n(A)+n(B)
Since A and B are disjoint, AB=ϕ
n(AB)=0
Now n(AB)=n(A)+n(B)n(AB)
=n(A)+n(B)0=n(A)+n(B).

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