Question

P (a)=0.4 and p (b)=0.5 and p (anb)=0.2 find p (b/a)

Answer 1

$\huge\boxed{\displaystyle \rm {Answer:}}$

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