If A and B are two disjoint sets, then n(A⋃B) is equal to A. n(A) + – InterviewSolution

1.

If A and B are two disjoint sets, then n(A⋃B) is equal to A. n(A) + n(B) B. n(A) + n(B) − n(A⋂B)C. n(A) + n(B) + n(A⋂B)D. n(A) n(B)

Answer»

Here,

A and B are two disjoint sets.

⇒ A⋂B = ϕ

⇒ n(A⋂B) = 0

n(A⋃B) = n(A) + n(B) - n(A⋂B)

= n(A) + n(B)-0

= n(A) + n(B)

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