I'm going to be doing some gambling with a friend. However, I'm not much of a gambler. I've decided that i'm going to play the roulette wheel with a goal of making 50 dollars. My system for winning this will be to bet 5 dollars each time on an even money bet like black or red, or odd or even. If i lose I will double my bet until i get my previous bet back. (martingale betting system) google this if your confused What are the chances of red comming up seven times in a row when i have a 48 percent chance of getting a my even money bet? My maximum bet is 500 dollars.