Question

If n(€) = 58, n(A) = 32, n(B) =20 and n(A U B)'= 18, find n(A U( reverse) B)​

Answer 1

Answer:

n(A∩B)=16−14=2

Step-by-step explanation:

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)

Given n(A)=7

n(B)=9

n(A∪B)=14

Substituting in 1

14=7+9−n(A∩B)

⇒n(A∩B)=16−14=2