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If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.
One bar code can have anywhere from 30 to 70 different combinations within itself. How many combinations are in the world is not known.
24
There are infinitely many numbers and so infinitely many possible combinations.
There are 39 possible combinations to obtain $0.49. See the image below with the complete list of possible combinations.