Look at the position of the dices when it puts on the rolers, then usually, the color below or the color you did not see wins. I usually bet after the dices are arranged so that i can see its position.
Every time I bet, I always choose color white but I don't do it consecutively because the odds became less. However, I still end up losing (maybe I'm just not so lucky lol). This was a cool strategy, I'll definitely try this the next time I go to carnival and see if it works 
. Thanks.