"Odds favor higher" - but it can be a 99.9% probability of gain and it's still possible to lose....just ask anyone selling 16 delta calls on the indexes for the last 5 months. They had a >80% chance of the calls expiring worthless each time but they lost 100% of the time (I might know someone who got burned a couple of times in this trade).  Probabilities are no match for a money printer.

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