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?  Choose the correct choice from the following:
A) 1/68  B) 60/68  C) 13/68  D) 13/48  E) 1/48
It doesn't matter which type of card you choose, so:   Probability of choosing 1st card: 1   Probability of choosing 2nd card of the same type: 5/17   Probability of choosing 3rd card of the same type: 4/16   Probability of choosing 4th marble of the same type: 3/15   Multiply and you get 1/68   1/68nswer 1/68.
<result>A</result>
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?