Probability Basics

Lesson 5 of 12

Every roulette outcome is based on probability.

In European Roulette there are 37 possible outcomes:

• Numbers 1–36
• One green zero (0)

Because every spin is independent, previous results do not influence future outcomes.

Many beginners believe that a number is "due" after not appearing for a long time. This is known as the Gambler's Fallacy.

Example:

If red appears 10 times in a row, the probability of red appearing on the next spin remains exactly the same as before.

Probability Examples

• Single number: 1 in 37 = 2.70%
• Red or Black: 18 in 37 = 48.65%
• Odd or Even: 18 in 37 = 48.65%

Understanding probability is the foundation of every roulette strategy.

Key Facts

• Each spin is independent
• Past results do not affect future results
• Probability never changes
• Understanding probability helps avoid common mistakes

Next Step

Continue with House Edge to understand why casinos have a long-term advantage.

Continue Learning:

• Gambler's Fallacy
• Independence of Spins
• Roulette Myths and Misconceptions

Next Lesson: House Edge →