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 = \{00, 0, 1, \l...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 = \{00, 0, 1, \ldots, 36\}. A 4-number bet or a square bet is a bet on the four numbers that form a square on the roulette table. The low bet is a bet on the numbers 1-18, and the high bet is the bet on the numbers from 19-36.