Question

if a and b are disjoint sets then n(a∩ b)​

Answer 1

Answer:

n(A) + n(B)

Step-by-step explanation:

n(A∪B)  = n(A) + n(B) -   n ( A ∩ B)

Substitute n ( A ∩ B)  = 0

=> n(A∪B)  = n(A) + n(B) -   0

=> n(A∪B)  = n(A) + n(B)

Answer 2

n(A∪B) is answer i hope it is correct