If you bet $100, your odds of winning are around 50% and if you lose, bet $200, and so on and so forth until you win, and then cash out with a guaranteed profit. Assuming odds of black are 47.37% as per American roulette, your odds of not winning a single one after 6 tries are 0.02125 (I think) and decrease exponentially after each subsequent try.
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If you’re nerve holds out as quite quickly the sums can get very large just doubling there is also the added issue that betting red or black on roulette is not a 50:50 odds, as there is a Green 0 or 00 this tips the odds ever so slightly towards the house
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