Question

n(A) = 5, n(B) = 4, find n(A-B) if A and B are disjoint​

Answer 1

Answer:

n(A-B) = 5

Step-by-step explanation:

A and B are disjoint so A∩B = 0

So n(A-B) = n(A) - n(A∩B)

= 5 - 0 = 5