The payout structures and odds of slot machines are determined by intricate mathematical principles that govern their operation. Return-to-player (RTP) percentages, which show the average amount of money that wonline slots that pay real moneyill be given back to players over time, are programmed into each machine. For instance, a machine with a 95 percent RTP should theoretically pay out $95 for every $100 wagered. However, since this number is based on millions of spins, individual players may see short-term results that differ greatly from this average. Slot machines classify their risk levels not only using RTP but also using volatility or variance.

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