Griffin has a bag of marbles that contains 7 black marbles and 5 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?	Choose the correct choice
A) 1/22
B) 2/33
C) 3/44
D) 4/55
E) 5/66
P(3 red marbles) = 5/12*4/11*3/10 = 1/22   The answer is 1/22.
<result>A</result>
Griffin has a bag of marbles that contains 7 black marbles and 5 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?