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Concept explainers
ISBN-13. The 13-digit book identification number, called the International Standard Book Number (ISBN-13), has its last digit as the check digit. The check digit works on a mod 10 clock. If the ISBN-13 has digits
If the ISBN-13 is correct, this new calculated number should be equivalent to 0 mod 10, that is, the sum should have its last digit being 0. For example, consider the ISBN 978-0-691-15666-8. To check this ISBN, we compute (mod 10):
Therefore, this number is a valid ISBN-13. Verify this check method for the ISBN-13 on the copyright page of this book.
![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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