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One of the oldest betting systems is the Martingale. The idea is that you keep doubling your bet until you win. Once you do win, your profit will be the amount of your first bet. For example, you bet $5 (and lose), then $10 (lose again), then $20 (lose), then $40 (lose), then $80 (win, finally). You made $75 in bets and won $80, for a profit of $5.
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