I think maths cannot help you in playing gambling because when you play you don't have to compute or get the formulas while playing gambling. All you need to think while playing gambling is whether you take the risk or not. But i think there are some gambling games that could help you in gambling like slot games and dice games.
With sports betting math can help to get rid of loss to some extent based on certain strategies. This won't be successful every time, because it gets successful results if the match has been going as we predict. Even a small change in the game plan that we predicted will end up in losing.
You are right about it and let me explain it too because maths has role here and we can not ignore it. It is useful in the distribution of cards and during game especially in card games because we can not distribute unequal cards. Further more luck is the major thing here but you can not ignore other contributing factors in which your experience about a specific game is required which increase your winning chances.