A marble shop contains 5 blue marbles, 5 red marbles, and 5 green marbles. If 2 marbles are purchased at random from the shop, what is the probability that the 2 marbles will be of the red?\nOptions:\n(A) 5/15\n(B) 2/21\n(C) 20/15\n(D) 5/210\n(E) 4/14 OK. Let's think. Some random thoughts first:
User
Of the 15 marbles we are wanting red:\nProbability of choosing 1st red marble: 5/15\nProbability of Choosing 2nd red marble: 4/14\nMultiply and you get 20/210 simplified to 2/21 The answer: (B).
Assistant