Two marbles are drawn randomly one after the other without replacement from a jar that contains 3 red marbles, 6 white marbles, and 3 yellow marbles. Find the probability of the following events.
(a) A red marble is drawn first followed by a white marble.
The probability is :
(b) A white marble is drawn first followed by a white marble.
The probability is :
(c) A yellow marble is not drawn at all.
The probability is :