A marble shop contains 6 blue marbles, 6 red marbles, and 6 green marbles. If 4 marbles are purchased at random from the shop, what is the probability that the 4 marbles will be the same color?\nOptions:\n(A) 1/68\n(B) 60/68\n(C) 13/68\n(D) 13/48\n(E) 1/48 Stream of consciousness first, then make a decision:
User
It doesn't matter which type of card you choose, so:\nProbability of choosing 1st card: 1\nProbability of choosing 2nd card of the same type: 5/17\nProbability of choosing 3rd card of the same type: 4/16\nProbability of choosing 4th marble of the same type: 3/15\nMultiply and you get 1/68
Thus, the answer is (A).
Assistant