5. An urn contains 5 red balls and 2 green balls. A ball is drawn. If it's green a red ball is added to the urn and if it's red a green ball is added to the urn. (The original ball is not returned to the urn.) Then a second ball is drawn. What is the probability the second ball is red? What do I know? What do I want to find? What do I expect the answer to be? How do I go from what I know to what I want to find out? Is the answer consistent with what I expected