Re: HSC 2013 4U Marathon
The answer is actually 9. You have to consider when the bracelet if flipped (i.e. anticlockwise is the same as clockwise). This makes combinations such as ggrggry the same as ggrggyr. These are the combinations: (ggrggyr, gggrgyr, ggggyrr, ggrgygr, gggrrgy, ggrrggy...