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In: Advanced Math

Is 100202345X a valid ISBN number? If not, what would the correct check digit have to...

Is 100202345X a valid ISBN number? If not, what would the correct check digit have to be ?

Solve the congruence 121x ≡ 5 mod 350.

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The last digit of a credit card number is the check digit, which protects against transcription errors such as an error in a single digit or switching two digits. The following method is used to verify actual credit card numbers but, for simplicity, we will describe it for numbers with 8 digits instead of 16: 1.) Starting from the rightmost digit, form the sum of every other digit. For example, if the credit card number is 4358 9795, then you...
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