1.

A and b are two sets,then the condition that they are to be disjoint sets,is​

Answer»

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)



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