Question

if (AuB)=15,n(A)=8,n(B)=12 find the n(AnB')​

Answer 1

Explanation:

ANSWER

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