Thanks Pythagorean.

I think I will try this one too.

I'll use a method called stars and bars.

Put the 12 stickers in a row (they are the stars)

Now we need to divide them into 4 groups. We can do this using 3 bars.

eg X X | X X X X | | X X X X X X represents the outcome of 2, 4, 0, 6

The question now becomes: How many positions can the 3 bars be placed in

The answer is 15C3 = 455 ways

Our answers are close Pythagoras but I think you have double counted some. ..