Roulette is played by means of a wheel which is divided
into 37 or 38 equal slots. Every slot is numbered 1
through 36 and colored red or black. On wheels used
in Europe and many other parts of the world there is
one slot which is green and is labelled as zero (0).
In the United States, most roulette wheels consist of
2 green slots labelled zero (0) and double zero (00).
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The dealer who supervises over the table
(also known as the croupier) throws a small ball around
the upper perimeter of the wheel. The ball is thrown
clockwise while the wheel is spun counterclockwise.
As the ball slows and gravity overcomes the force, the
ball ultimately falls into one of the 37 or 38 pockets.
That is how a number is selected.
It should be noted that the numbers on the roulette
wheel are not in order but are staggered to create a
random effect and also red and black sections are alternated.
So the wheel is a mechanical random number generator.
