Question: If one ball is drawn from the bag in Problem, what is the probability that the ball is white, given that the ball is odd-numbered?
Problem: A bag contains 9 red balls numbered 1, 2, 3, 4, 5, 6, 7, 8, 9 and 6 white balls numbered 10, 11, 12, 13, 14, 15. One ball is drawn from the bag. What is the probability that the ball is red, given that the ball is even-numbered?