When playing live roulette with other players, you and another player may both want to place the same bet, say, on the same number. That is perfectly fine. In fact, when you play roulette games in a casino, players are given special chips of different colors so the croupier can keep track of who has bet what. Of course, when you play online roulette, this is never an issue as you aren’t playing with other players (unless it is live dealer roulette).