Question

let A and B be the events such that p(A)=3/10,p(B)=1/2,and p(B/A)=2/5

Answer 1

P(A/B) P(A)
---------- = --------
P(B/A) P(B)

P(A/B) 3/10
----------- = --------
2/5 1/2

P(A/B) = 3/10×2/5×2
=6/25