Computers and Technology, 09.10.2019 19:00 tamera62
Credit card numbers follow certain patterns. a credit card number must have between 13 and 16 digits. the starting numbers are: 4 for visa cards, 5 for mastercard cards, 37 for american express cards, and 6 for discover cards. example: validating 4388576018402626 a) double every second digit from right to left. if doubling of a digit results in a two-digit number, add the two digits to get a single digit number.
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Credit card numbers follow certain patterns. a credit card number must have between 13 and 16 digits...
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