Note : Whenever you use a formula, please detail in sentences exactly how/why it works for your particular solution (merely plugging values into a formula does not by itself demonstrate understanding). Proving a more general case of the formula(e) is another valid strategy.

question:  A painter has ten white candles (labelled 1, 2, 3, . . . , 10) , and (s)he wants to paint three of them red, three of them green and four of them blue. In how many ways can the painter do this?