Two marbles are drawn one after the other with replacement from a bag that contains: 9 red marbles, 8 blue marbles, and 3 green marbles. Find the probability of the following events.
(a) One red marble and one green marble are drawn in either order.
(b) Two blue marbles are drawn.
(c) At least one marble is drawn that is not blue.
(d) The second marble is green if we know that the first marble is green.