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@@ -663,7 +663,7 @@ numericq(val)
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##### Question
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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).
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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).
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Let's see if `4137 8947 1175 5804` is a valid credit card number?
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