Sample space: marbles Given a bag of 5 different colour marbles: R, G, B, W, Y, we need to create a sample space to
study the outcome of when 3 marbles are picked out of the five marbles in the bag.
The way I approached this, is that since we are creating a sample space for 3 marbles picked
out of 5, then there is 5 choose 3 ways to make the selection.
Therefore, 5 choose 3 = 10 = {(RGB), (RGW), (RGY), (RBW), (RBY), (RWY), (GBW), (GBY), (GWY), (BWY)}

Have I done this correctly?

Yes, as long as the order of appearance does not matter.
