Question

if a and b are two disgoint sets the n(anb) =?​

Answer 1

Answer:

0

Step-by-step explanation:

By anb , we refer to the common elements in seta a and b

If a and b are two disjoint sets then they don't have any common elements.

So, anb is an empty set.

The cardinal number or "n" of an empty set is 0.

So, the answer is 0.

Hope you found this explanation helpful :)

Answer 2

Answer:

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Step-by-step explanation:

Correct option is

A

n(A∪B)=n(A)+n(B)

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)