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How casinos make money: why the house always wins, even on the nights you win

The casino does not mind when you win at roulette all night. Its whole business rests on one small pocket marked zero, and on millions of bets. Here you learn the house edge, the law of large numbers that turns it into a steady income, the slot machine tricks called losses disguised as wins and near misses, and why doubling your bet after each loss, the martingale, ends in one big loss.