I do not think that using math or other predictions you can win in gambling, and especially in roulette. There everything is designed for pleasure, not profit.
Yes, that's true. Even if you are very good in math, it will not help you to win the gambling game because in gambling it does not depend on how you play it. But it depends on your luck of winning. If you are really lucky on that day, then surely you will win but if you are not lucky, of course you will always lose the gambling game.