They are usually expressed in the form of a ratio or fraction. This represents the payout a player can expect to receive for a winning bet.While both terms relate to the likelihood of winning, they hold distinct meanings that profoundly impact players’ understanding of the game and their betting strategies. Roulette odds and probability are two essential concepts that dictate the outcome of each spin. Understanding Roulette Odds and Probability The objective of playing roulette is to predict and bet on the winning number or group of numbers that the ball will land on after the wheel is spun.