Three cards are chosen at random from a standard 52-card deck. What is the probability that they are not all the same color?

Three cards are selected from a standard deck of 52 cards. Disregarding the order in which they are drawn, the possible outcomes are (52/3). Out of these, how many include all cards of the same color (say red) ? There are (13/3) ways in which you can get all 13 red cards.