Question

Exercise 23. One bag contains 5 white and 4 black balls. Another bag contains 7 white and 9 black balls. A ball is transferred from the first bag to the second and then a ball is drawn from the second bag. Find the probability that the ball drawn is white.

Answer 1

the total of all ball 5+4+7+9=25balls
white ball are 5 and 7
so5+7 =12 white balls
probability
is 12/25=0.48