Naturally, we assume mathematically that the wheel is fair, so that the random variable \(X\) that gives the slot number of the ball is uniformly distributed over the sample space \(S = \\) for each \(x \in S\). Eventually the ball falls into one of the slots. The wheel is spun and then a small ball is rolled in a groove, in the opposite direction as the motion of the wheel. A typical roulette wheel and table, modified from Wikimedia Commons The strange order of the numbers on the wheel is intended so that high and low numbers, as well as odd and even numbers, tend to alternate. The (American) roulette wheel has 38 slots numbered 00, 0, and 1–36.
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