UPC Barcode Validation

The check digit of a 12-digit UPC code is chosen such that the weighted average of all the digits is a number which ends in zero. Digits in odd positions are weighted 1 and digits in even positions are weighted 3. Calculate the missing check digit of this UPC:

3 73599 83021 ?

• 0

• 1

• 2

• 3

What is the check digit in the following UPC Number?

0-58200-48826-d

The check digit in a UPC number (that is, the twelfth digit) is determined in the following manner:

 Multiply the first digit by 3.

 Add the second digit.

 Multiply the third digit by 3.

 Add the fourth digit.

 Continue this alternating process for the Digits 5 to 12.

• 5

• 4

• 7

• 0

a form of redundancy check used for error detection on identification numbers (e.g. bank account numbers) which have been input manually.

• At times, Martin can be violent. 
• check digit 
• index
• paradox

The check digit in a UPC number (that is, the twelfth digit) is determined in the following manner:
 Multiply the first digit by 3.
 Add the second digit.
 Multiply the third digit by 3.
 Add the fourth digit.
 Continue this alternating process for the Digits 5 to 12.
Is 0-58200-48826-5 is a valid UPC number.

• yes
• no