For this strategy, you start by wagering the table minimum on a 50/50 outside bet. You keep betting that amount until you lose. When that happens, you double your bet for the next spin and keep doubling your bet until you win.
What are the odds of hitting red or black in roulette? The odds of hitting red or black in American roulette are 47.4%. This rises slightly in European roulette, to 48.6%.