You should do as much research possible and look up until you fully recognize the concept of fixed odds gaming.
Say the payout percentage for slots is 96.5%, that means that for that particular game, a total of 96.5% of all bets will be re-won, an enormous stop 3.5% within a cycle. https://hocvienboardgame.net/tin-tuc/choi-lo-de-tai-rikvip-trai-nghiem-thu-vi/