Question

If n( AUB) = 29, n( A∩B) = 8 & n(B) = 18 , then find n(A)

A) 11
B) 19
C) 27
D) 15

Answer 1

Answer:

B) 19

Step-by-step explanation:

hope it will help you

Answer 2

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