First dozen / Premiere douzaine: numbers 1 - 12 (On the French-style mat, the square marked 12P) Middle dozen / Moyenne douzaine: numbers 13 - 24 (On the French-style mat, the square marked 12M) Last dozen / Dernier douzaine: numbers 25 - 36 (On the French-style mat, the square marked 12D)

For columns and dozens, the bet covers 12 numbers, which means that the odds are 31.58% and 32.43% for the two versions, respectively. These pay 2:1, so a successful bet ofR$100 on a column will result in aR$200 profit, plus theR$100 bet back.

What Einstein actually meant was that there is no mathematical trick that can help you win at roulette. Each spin is an independent trial and, in the long run, the casino will win. This is different to a game such as Blackjack where the probabilities change as cards are dealt.

Some bets in American Roulette have an even higher house edge than the 5.26% average. For example, a bet on the Five Numbers (0, 00, 1, 2, 3) carries a house edge of 7.89%. Outside bets in roulette carry the lowest risk. They cover more numbers yet the payouts are lower (1/1 for Red, Black, Odd, Even, 1 18, 19 36).