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 black? Answers:
A) 4/11  B) 5/22  C) 7/33  D) 8/55  E) 9/77
P(3 black marbles) = 7/11*6/10*5/9 = 7/33   The answer is 7/33.
<result>C</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 black?