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How to Verify a Credit Card Number Using the Luhn Algorithm

This guide explains how to verify a credit card number using the Luhn algorithm. Beginning with the second digit from the right, you'll double every other digit. After processing the digits, you'll break them into individual digits and sum them. If the total ends in zero, the credit card number is valid. An example (49927398716) illustrates each step, ensuring clarity in performing the calculation. Follow these steps to confidently verify credit card authenticity.

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How to Verify a Credit Card Number Using the Luhn Algorithm

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  1. Method for verifying a credit card number: Example: 49927398716

  2. Method for verifying a credit card number: 1. Starting with the second digit from the right, Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6

  3. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 2 6

  4. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 16 7 2 6

  5. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 6 9 16 7 2 6

  6. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6

  7. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 1 8 9 4 7 6 9 1 6 7 2 6 = 70

  8. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, and add the digits together Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 +1+8+ 9 + 4 + 7 + 6 + 9 +1+6+ 7 + 2 + 6 = 70

  9. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, and add the digits together 3. Result must end with 0 (e.g 70) Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 +1+8+ 9 + 4 + 7 + 6 + 9 +1+6+ 7 + 2 + 6 = 70

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