Question 4 Determine the check digit of the ISBN: \( 978-0-7432-5820 \) 2 3 7 4
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Step 1: Write down the digits of the ISBN without the check digit (which we will call x): \( 9, 7, 8, 0, 7, 4, 3, 2, 5, 8, 2, 0, x \) Show more…
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Determine whether the check digit of the ISBN-10 for this textbook (the eighth edition of Discrete Mathematics and Its Applications) was computed correctly by the publisher. The United States Postal Service (USPS) sells money orders identified by an 11 -digit number $x_{1} x_{2} \ldots x_{11} .$ The first ten digits identify the money order; $x_{11}$ is a check digit that satisfies $x_{11}=x_{1}+x_{2}+\cdots+x_{10} \bmod 9 .$
Determine the check digit for the UPCs that have these initial 11 digits. $$ \begin{array}{ll}{\text { a) } 73232184434} & {\text { b) } 63623991346} \\ {\text { c) } 04587320720} & {\text { d) } 93764323341}\end{array} $$
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