In a real casino math is to calculate your bankroll and winning chance- but still you stand no chance against a good dealer regarding the roulette. I have seen guys landing the ball in desired zone of the wheel...But that is different story. Online casinos are different. I conducted an experiment regarding the roulette. 35 low rolls on a fresh account with no bet history, and then I bet on all the numbers which didn't come out in those 35 rolls - 11 in total. I got a hit. Next roll- I got a hit as well. So I continued the system until there were 4 numbers left and I stopped. My longest loosing streak was 4 rolls. Lucky? Beginners luck. Random generator is supposed to generate random numbers within 0- 36 (speaking of roulette), and it will generate 98% of those numbers in 100 rolls. If you have empty roll history.... The more you play the more complicated the things become. In the long run you gonna lose...