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Roulette Probability of Outcome

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Do the odds change with every spin of the roulette wheel? By Kanzen Jacob Kanzen

Casino roulette wheel, dealer about to spin the wheeel.
Is number 20 less likely to come up after four successive outcomes?

Roulette numbers outcome panel.

Four successive outcomes of the same number, say; 20 20 20 20, is a rarity. Indeed, the sequential probability of four 20s coming up in a row is very high (1/38 x 1/38 x 1/38 x 1/38 = 1/2,085,136 - that is one in two million), but the absolute probability of number 20 to come up at each spin is always 1 in 38 (on a double zero Roulette wheel).

If a sequence of four of the same number is a rarity, a sequence of any four numbers is equally a rarity such as 32 12 5 26 or 21 8 35 13. This is not obvious simply because a sequence of 20 20 20 20 is easier to notice than, say; 32 12 5 26. If you have never seen an outcome of four 20s in a row, it is unlikely that you have seen a sequence of 32 12 5 26 or 21 8 35 13. They are just as rare to occur.

Therefore, five successive outcomes of the same number, like 20 20 20 20 20, will be as rare as 20 20 20 20 X, where X can be any number on the Roulette wheel. Although such a sequence is indeed more of a rarity, the number 20 is no more or less likely to appear as the fifth number in the sequence.

The intrusion of absolute probability into sequential probability does not allow you to gain an advantage. See a practical example.

Kanzen Tip: If you are influenced by previous results, then learn to bet with the outcome and not against it. You will eventually realize that it makes no difference. If anything, the 'law of unequal distribution' will be on your side.

See this: Two major factors determine how much you win or lose playing roulette. By managing and controlling these two factors, you can generate an advantage that in the long term can make you a winner and keep you ahead of the casino at all times. Find out what these two factors are and what makes a winning system, in the main strategy page titled Winning at Roulette.

Winning at Roulette
Interesting facts, tips and a system.
Winning at roulette.

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