Question

If A and B are two disjoint sets then define 1)A intersection B and 2)A-B​.


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Answer 1

Answer:

n(A∪B)=n(A)+n(B)

Step-by-step explanation:

A and B are two disjoint sets.

∴ A∩B=ϕ ⟹ n(A∩B)=0

Since, n(A∪B)=n(A)+n(B)−n(A∩B)

=n(A)+n(B)−0=n(A)+n(B)

Hence, n(A∪B)=n(A)+n(B)