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Concept explainers
Check a code. U.S. Postal Money Order serial numbers, airline ticket identification numbers, UPS tracking numbers, and Avis and National rental car identification numbers all use the mod 7 check digit procedure. Find an example and check the check digit. For instance, get a copy of an airline ticket and check the identification number.
![Check Mark](/static/check-mark.png)
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Chapter 2 Solutions
The Heart of Mathematics: An Invitation to Effective Thinking 4e + WileyPLUS Registration Card
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