A box contains 3 blue marbles, 2 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue? Choose the correct choice
A) 1/286
B) 2/455
C) 1/91
D) 4/455
E) None of these
Given that there are three blue marbles, two red marbles, six green marbles and one yellow marbles.   Probability that all the three marbles picked at random are blue = 3C₃/13C₃ = (1 * 3 * 2 * 1)/(13 * 12 * 11) = 1/286   1/286NSWER:1/286
<result>A</result>
A box contains 3 blue marbles, 2 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?