Most roulette tables have a green felt surface with a white ball spinning around. The ball eventually falls into one of 37 (in European roulette) or 38 (in American roulette) numbered and colored pockets on the wheel.
The colors alternate between red and black except for the green 0 and sometimes also 00 (in American roulette). There is also a bet on 0,00,1,2,3 (the first four numbers), which pays 6 to 1.
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The probability of the ball landing on any given number is 1 in 37 or 1 in 38 (for American and European roulette respectively). The probability of the ball landing on green is therefore 2 in 37 or 1 in 19 (for American and European roulette respectively).
The odds of the ball landing on green are therefore 1 in 19 (for European roulette) or 1 in 38 (for American roulette).
