The probability of the ball landing on the number "Zero" in a standard European roulette wheel is 1/37, or approximately 2.7% of the time. This is because there are 37 numbers on the wheel, including the single "Zero" pocket.

You receive a 2:1 payout (double your bet) by choosing the correct column. Dozens  Another bet that covers a dozen numbers, these three selections are actually in numerical order. That means 1st 12 is numbers 1-12, 2nd 12 includes 13-24, and 3rd 12 covers 25-36. Each dozen pays 2:1, or double your bet.

2/1 odds means you'll winR$2 for everyR$1 you bet. AR$100 bet at 2/1 odds would winR$200, for a total payout ofR$300.