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redit card number for demonstration purposes. Start by looking at the last digit on the card - this is the check digit. The Luhn formula is used to validate the rest of the numbers. Double every second digit starting from the right, and if the resulting number is greater than 9, add the two digits together. Then, add up all the numbers. The total should be divisible by 10 if the card number is valid. This formula is used to ensure the accuracy and security of credit card transactions.