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Depending on the style of game, a standard roulette wheel has 18 red numbers, 18 black numbers, and 1 or 2 green numbers. In American roulette, there are two green numbers, which are 0 and 00, however there is only one green number in European roulette, which is 0. Except for the green numbers, the numbers on a roulette wheel are placed in random order and alternate between the hues red and black.