Question

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

Answer 1

if white ball is transferred from the first bag.
total number of balls= 9 + 7 + 1 =17
number of white balls = 1
p(getting a white ball) = 1/17

if white ball is not transferred then
p(getting a white ball) = 0