Suppose you have 3 red marbles, 2 blue marbles, and 4 yellow marbles in a bag.What is the sample space for an experiment where you pull 2 marbles at random from the bag?

Note: "R" = red marble, "B" = blue marble, and "Y" = yellow marble, so "RYB" means that you drew a red marble, then a yellow marble, then a blue marble.

help!