Posted by anoynomous on .
There are two bags out of which Bag 1 contains 2 white and 3 red balls and bag 2 contains 4 white and 5 red balls. 1 ball is drawn at random from one of the bags and is found to be red. Find the probability that it was drawn from bag 2

maths probabilty(me posted third time)plse answer 
PsyDAG,
I know the probability of drawing red from the second bag = 5/9, but I don't know how to discount not drawing from the first bag. That is why I did not respond to you previously.