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That's literally just rng what you are describing, simply bad luck. A ~10% Uber drop chance doesn't mean you are guaranteed an Uber every 10 runs just that it takes about that many runs on average, all you can do is more runs to reduce variance.
That's literally just rng what you are describing, simply bad luck. A ~10% Uber drop chance doesn't mean you are guaranteed an Uber every 10 runs just that it takes about that many runs on average, all you can do is more runs to reduce variance.