In Exercise, find the check digit d in the given Universal Product Code.
Consider the UPC [0, 4, 6, 9, 5, 6, 1, 8, 2, 0, 1, 5].
(a) Show that this UPC cannot be correct.
(b) Assuming that a single error was made and that the incorrect digit is the 6 in the third entry, find the correct UPC.
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