So let's say I start with 1000 units. Win is 18/37 and lose is 19/37.

With this system I can't lost more than 9 times in row: (19/37)^9 = 0.0025 = 0.25%

This probability means that statistically, 1 of roughly 402 Martingale cycles will result in losing 9 bets in a row, causing the player to be unable to place another bet.

So if I'm not totally unlucky, I should be able to make some money right? Just asking I'm not gambler, as I said I've tried roulette for the first time last weekend. Just wanna know what is the probability of winning some money.