Therefore, the presence of this additional green number ever so slightly decreases the probability of hitting other specific numbers or sets of numbers, whether it be over one spin or over multiple spins. The probabilities in American and European roulette are different because American roulette has an extra green number (the double zero - 00), whereas European roulette does not. Why is there a difference between European and American roulette? The 0 or 00 appearing at least once over 10 spins.ģ. This is not because the American wheel is 'fairer' and dishes out red/black colors more evenly - it's because there is an additional green number (the double zero - 00) that increases the likelihood of disrupting the flow of successive same-color spins. You'll also notice that it's less likely to see the same color appear on multiple spins in a row on an American roulette wheel than it is on a European wheel. The probability of seeing the same color appear on successive spins just over halves from one spin to the next. Example: The probability of the same color showing up 6 times in a row on an American roulette wheel is 1.13%.
