13. Suppose that a bag contains 43 red balls, 54 blue balls, and 72 green balls, and that 2 balls are chosen at random without replacement. Construct a probability tree for this problem. (a) What is...

13. Suppose that a bag contains 43 red balls, 54 blue balls, and 72 green balls, and that 2 balls are chosen at random without replacement. Construct a probability tree for this problem.
(a) What is the probability that 2 green balls will be chosen?
(b)What is the probability that the 2 balls chosen will have different colors.