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jverzani committed 2024-10-15 17:45:52 -04:00
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##### Question
Credit card numbers have a check digit to ensure data entry of a 16-digit number is correct. How does it work? The [Luhn Alogorithm](https://en.wikipedia.org/wiki/Luhn_algorithm).
Credit card numbers have a check digit to ensure data entry of a 16-digit number is correct. How does it work? The [Luhn Algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm).
Let's see if `4137 8947 1175 5804` is a valid credit card number?