Question

if A and B are two finite sets then n(A) + n(B) is equal to _____________​

Answer 1

Answer:

n(AUB)-n(A intersection B)

intersection is written as upside fown U

Answer 2

Answer:

Since n(A ∪ B) = n (A) + n (B) – n (A ∩ B) So, n(A) + n (B) = n (A ∪ B) + n (A ∩ B)