Concept explainers
Money orders. U.S. Postal Money Orders have a 10-digit serial number and a check digit. The check digit is the number between O and 6 that represents what the 10-digit serial number is equivalent to using a mod 7 clock. This check digit is the same as the remainder when the serial number is divided by 7. What is the check digit for a money order with serial number 6830910275?
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