An urn has 5 white and 10 red balls. Roll a fair die. Draw the number of balls equal to the number showing on the die. Question 1: P(all white)? Question 2: What is the probability that the die showed 3, given that all of the balls drawn were white? Solution a) P(all white) = (1/6)* (5C5 /15C5) b) (1/5)*(5C3 /5C5).