200
A box contains a red marble, a green marble, a yellow marble, a blue marble, and no other marbles. Two marbles are to be chosen at random from the box without replacement. If the first marble chosen is green, what is the probability that the second marble chosen is green, what is the probability that the second marble chosen will be blue?
(A) 1/4, (B) 1/3, (C) 1/2, (D) 2/3, (E) 1
What is (B) 1/3.