That difference is where the casino (see post) makes its money. Wager Kind
Numbers Covered
Payout
Chance to Win
Straight Up
1
35 to 1
2.70%
Split
2
17 to 1
5.41%
Street
3
11 to 1
8.11%
Column/Dozen
12
2 to 1
32.43%
Red/Black (Even Money)
18
1 to 1
48.65%
Notice how the probability of winning is always slightly less than what a "fair" payout would be.
Cracking the Code of the Wheel
Roulette is a game of pure fortune, casino (dailysaudinews.com) but its outcomes are governed by the laws of probability. Understanding the math behind the wheel can't change the odds, casino (legalkamkaj.com) but it can help you make more informed decisions and casino (Kanghehealth blog post) appreciate the game on a deeper level. The key element is the "house edge," which is the casino's built-in advantage.
Never touch your cards in a game where they are dealt face-up. Act in turn and casino (121.36.226.23) don't "splash the pot" (throw your chips into the middle).