Bag I contains 3 red and 4 black balls and bag II has 4 red and 5 black balls.

one ball is transferred frm bag I to II and then a ball is drawn frm bag II. the ball so drawn is red in clour. find the probablity dat transferred ball is black.

 

Now suppose

E1=event of ball transferred frm bag I is red

E2= event of ball transferred frm bag I is black

A- event of drawing red ball

 

then wat is

P(A/E1).....is it 1/2??

plz explain!!