2 to the power 16.
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Way to many (:
Two make combinations you would take 2x1=2 combinations only
125
If you have 4 positions, each of which can hold any of the ten digits, you have 10 to the power 4 combinations. If you can have only 4 different digits, you have 4 to the power 4 different combinations.
One bar code can have anywhere from 30 to 70 different combinations within itself. How many combinations are in the world is not known.