Two marbles are drawn at random and without replacement from a box containing 2 red, 3 green, and 4 blue marbles. Let's define the following events: A = {two red marbles are drawn} B = {two green marbles are drawn} C = {two blue marbles are drawn} D = {two marbles of the same color are drawn} Find the probabilities of the following events:

(a) P(A), P(B), P(C), and P(D). [It's four separate questions.]

(b) P(A|D).