Re: Roulette: what to do after 100 'red'-spins

AngTalunin wrote:
This evening I was having a discussion about the chances on a roulette table.

Suppose we only bet red or black and the wheel has spun 100 times red in one role (with no black, green between it).
What should we bet on next? Should this be red, black, or doesn't it matter?

If the wheel and the dealer are fair (so every run is indeed random), it does not matter.

But I read some things about dealers who spin the wheel and throw the ball the same every time (so the outcome of the run could depend on the previous run). But can this give you enough information to say black or red?
Or this this just give you a range of number and is the chance in this range for red and black the same?

That is correct. It doesn't matter if you get 10, 100 or 1000 reds in a row. IF the system is "fair" then every next spin still has an 18/37 chance of landing on red, independent of what came before. Admittedly, the odds of getting 100 reds in a row is fantastically small at (18/37)^100 ... roughly one in 20 nonillion. But hey that's still >0. Ex nihilo nihil fit.

So it's possible. Just very, very, very improbable. I did a quick Google search. Apparently the longest run of any one colour in a row on a roulette wheel is 27 spins.
.

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