The roulette odds of winning a round depend on the number of outcomes covered in the bet. If you bet on only one number, you are facing 1-in-37 odds in European roulette and 1-in-38 odds for the American version. In both cases however, the roulette payout for straight bets is 35:1.
Random number generation\n\n Online casinos use software programmes to mimic the random generation of numbers that a real-life roulette wheel produces. The software continuously produces a sequence of numbers, and when the 'wheel' stops, the latest number from the sequence is chosen as the number the 'ball' lands on.