Question

If two sets A and B are disjoint then n
(AUB) =​

Answer 1

Answer:

n(A) + n(B)

Step-by-step explanation:

Disjoint sets means their intersection is zero

i.e (A∩B) = 0

So, (A ∪ B) = n(A) + n(B) - n(A ∩ B)

                  = n(A) + n(B) - 0

                  = n(A) + n(B)