1. Add the check digit at the end of the number
054506967 ?2. Find the weight of each number. (Weight is in descending order) 0[10] 5[9] 4[8] 5[7] 0[6] 6[5] 9[4] 6[3] 7[2] ?[1]3. Multiply number with its weight.
0 45 32 35 0 30 36 18 144. Add the products together. =2105. Divide it by "11"
210/116. Subtract the remainder from "11", the answer will be the check digit.
Remainder=1Check Digit=11-1
=10
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There are 10 to the 10th power possibilities of ISBN numbers if d represents a digit from 0 to 9 and repetition of digits are allowed. That means there are 10,000,000,000 ISBN numbers possible.
check digit
A check digit can be added to any set of numbers primarily to check for errors in the data. The check digit is seen as an equivalent to binary checksum which is used for the older and now less used binary system.
Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.
Digit Check