Books are assigned identification numbers called ISBNs. Each ISBN is a ten-digit number such as $0 - 673 - 99893 - 2$. The final digit is called the check digit which is determined on the basis of modular arithmetic. The final (check) digit is obtained as follows: start at the left and multiply the first nine digits of the ISBN number by $10,9,8,7,6,5,4,3$, and 2 respectively. Then add these products. The check digit is the smallest number that must be added to the result to get a multiple of 11 .
Find the check digit for the ISBN 0-681-81927-__.
A) 1
B) 7
C) 8
D) 4

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The Answer of Books are assigned identification numbers called ISBNs. Each ISBN is a ten-digit number such as $0 - 673 - 99893 - 2$. The final digit is called the check digit which is determined on the basis of modular arithmetic. The final (check) digit is obtained as follows: start at the left and multiply the first nine digits of the ISBN number by $10,9,8,7,6,5,4,3$, and 2 respectively. Then add these products. The check digit is the smallest number that must be added to the result to get a multiple of 11 .
Find the check digit for the ISBN 0-681-81927-__.
A) 1
B) 7
C) 8
D) 4

Books Are Assigned Identification Numbers Called ISBNs 0−673−99893−20 - 673 - 99893 - 20−673−99893−2

Books Are Assigned Identification Numbers Called ISBNs $0 - 673 - 99893 - 2$