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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The casino normally has limits as to how much you can bet, so after a certain amount, you can’t keep doubling your bets. As a side note, I also considered this once time at a casino. I didn’t bet any money but imagined I had used this exact strategy on Black. I promise you, Red came up 13 times in a row! That’s when I never considered that tactic ever again.
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