In how many ways can a collection of 10 marbles be formed from Red, Yellow and Blue marbles? When only the number of Red, Yellow and Blue marbles matter, not the order in which they are drawn.
I am thinking this has something to do with a ball and box problem? I thought that taking 3^10 and dividing it by 10! would work but the answer is a pretty big fraction.
Could someone please help me? Which are the balls and which is the boxes?