Q. One bag contains 5 white and 4 black balls.Another bag contains 7 white and 9 black balls.A ball is transferred from first bag to second and then a ball is drawn from the second bag.Find the probability that the ball drawn is white.

Option
A)7/18
B)5/9
C)4/9
D)11/18

• here 2 cases::
  1) transferred ball is white
  then choosing that white ball from 1st bag is 5/9
  and now there are 8 white,9 black in 2nd bag
  so prob of choosing white from 2nd is=(5/9)*(8/17)....(1)
  2) let the ball transferred is black with prob 4/9
  in the same way as above,, prob is (4/9)*(7/17).........(2)
  
  reqd prob is (1)+(2)=4/9
• 11 years agoHelpfull: Yes(3) No(0)
• 4/9 is d ansr
• 10 years agoHelpfull: Yes(0) No(1)