Griffin has a bag of marbles that contains 7 black marbles and 4 red marbles. If he removes 3 marbles at random without replacing any of the marbles, what is the probability that all 3 marbles selected will be red?  Select.
A) 2/55 B) 3/85 C) 4/105 D) 4/165 E) 8/165
P(3 red marbles) = 4/11*3/10*2/9 = 4/165   The answer is 4/165.
<result>D</result>
Griffin has a bag of marbles that contains 7 black marbles and 4 red marbles. If he removes 3 marbles at random without replacing any of the marbles, what is the probability that all 3 marbles selected will be red?