- #1
Yankel
- 395
- 0
Hello all
I have a little problem with this short question, would appreciate your help.
Let A and B be two events such that:
P(A|~B) = 1/2 and P(B?AUB) = 2/5
(~B means not B)
Find P(B)
The final answer should be 1/4, I can't get there. I did some work with the conditional probability formula, got P(B)=2/5 * P(AUB) and P(B)=1-2*P(A and ~B). But where do I go from here ?
Thank you in advance !
I have a little problem with this short question, would appreciate your help.
Let A and B be two events such that:
P(A|~B) = 1/2 and P(B?AUB) = 2/5
(~B means not B)
Find P(B)
The final answer should be 1/4, I can't get there. I did some work with the conditional probability formula, got P(B)=2/5 * P(AUB) and P(B)=1-2*P(A and ~B). But where do I go from here ?
Thank you in advance !