Question Statement 4 boxes each contain a large number of identical balls, those in 1 box are red, those in the 2nd box are blue, those in the 3rd box are yellow and those in the remaining box are green. In how many ways can a set of five balls be chosen? (without restriction) My thoughts If the question is asking for the permutation, then the answer is 4^5 (since there is 4 colour and the colour can be repeated) But the question is asking for combinations. How should I attempt this question? Should I consider cases where all colours are the same/ different, 2 same 3 different.....etc.?