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If you know that quite will appear 8 times before all numbers have come out in the very once, then, by keeping files of all previous numbers which will cause that event to occur, you can more accurately choose which numbers to bet on, thereby lowering the probability to below 1/35 of hitting that a variety. Since Roulette pays you 35 times the number bet not to mention the original bet, this will give you an expected return that is positive the actual short and long