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Unformatted text preview: is the last digit, obtained as follows: Compute the sum of all other digits, then divide by 9 and take the remainder. Subtract it from 9. The result is the check digit. Is this check genuine? Verify that this check digit scheme can be used to recognize substitution of any single digit by another. Show that inversions (e.g 35 rather than 53) can not be recognized. 3. (extra) Find out how the check-digit scheme of the ISBN-code for books works. Verify that it can detect inversions. Is 0-273-00218-9 a valid ISBN-number? Why (not)?...
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This note was uploaded on 12/09/2009 for the course MA 1002 taught by Professor N/a during the Spring '09 term at NYU Poly.
- Spring '09