Which check digit would make this credit card number valid: 5552 2234 5678 091d
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
Which check digit would make this credit card number valid: 5552 2234 5678 091d?
Expert Solution
Step 1
The given number is . The purpose is to find d such that the credit number is valid.
The steps are as follows.
1. Double the value of each alternating digit starting from the second digit.
2. Add the values obtained keeping the other digits same.
3. Find (mod 10) of the sum obtained in the above step. If the remainder is 0, the card number is valid.
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