I have a question on a review that I just cannot crack.
It goes as follows:
"Event A occurs with probability .4. The conditional probability that A occurs given B occurs is .5, while the probability that A occurs given that B does not occur is .2. What is the conditional Probability that B occurs given A occurs."
P(A) = .4
P(A|Not B) = .2.
I've tried multiplying things out. I just can't get it .
Can anyone help?