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Virtually every item sold in a store has a 12-digit UPC barcodewhich is scanned at the checkout counter. The first 11 digits of aUPC number d1d2d3 ? ? ? d11d12 identify the manufacturer andproduct. The last digit d12 is a check digit which is chosen sothat 3d1+d2+3d3+d4+3d5+d6+3d7+d8+3d9+d10+3d11+d12 =0 pmod10q.

If the congruence does not hold, an error has been made and theitem must be scanned again, or the UPC code entered by hand. Whichof the following UPC numbers were scanned incorrectly?

a)037000356691(b)833732000625(c)040293673034

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Elin Hessel
Elin HesselLv2
12 Aug 2019

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