Description
1. What does the check digit need to be so that the following UPC will be valid?
48900003782-D
Be sure to explain your answer.
2. Is the following UPC code valid?
08500001818-7
Be sure to explain your answer.
3. Is the following UPC code valid?
00498847303-7
Be sure to explain your answer.
4. Is the following UPC code valid
07385200131-1
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5. Is the following UPC code valid?
08200019298-5
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6. What does the check digit need to be so that the following UPC will be valid?
38748473674-D
Be sure to explain your answer.
7. What does the check digit need to be so that the following UPC will be valid?
27000892873-D
Be sure to explain your answer.
8. Show that 4128 0012 4389 0110 is an invalid VISA credit card number.
Explanation & Answer
I did it, review please:
The rule for UPC is:
3 * (sum of digits on odd positions) + (sum of digits on even positions) is divisible by 10.
1. 48900003782-D gives 3*(4+9+0+0+7+2) + (8+0+0+3+8+D) = 66 + 19 + D = 85 + D, so D=5.
2. 085000018187 gives 3*(0+5+0+0+8+8) + (8+0+0+1+1+7) = 63 + 17 = 80, so yes.
3. 004988473037 gives 3*(0+4+8+4+3+3) + (0+9+8+7+0+7) = 66 + 31...
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