I think the only formula that may help in gambling is probability for roulette games, but i still believe math cannot affect to gambling games even you used probability because probability is all predicting the chances. I believe it is all about luck, so if you wanted to win you need to have good luck.
Roulette Games? You can predict the probability of your gambling every time but you can't predict the results of your gambling activities, well, that is obvious right. No matter what gambling or betting game is it, you can solve for your bet's probability to win, some of them may be of 1% or more but it is usually less but as I've said, no one can predict or solve for the result.