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How To Validate a Credit Card Number Manually Using Simple Math

Ever wanted to check the genuineness of any credit card number ?

Well, you can easily verify the genuineness of any credit card number, by using a simple math,

The credit card numbers are not randomly selected, but it follows a specific rule named (Luhn algorithm) which could be used to cross-check that whether a credit card is valid or not.

Procedure for validating the credit card manually :

  1. First of all write the number of the credit card which you want to verify,
  2. Then double the alternate digits, starting from the 2nd number (from right). Note each down to the original credit-card number, and put a cross mark on the left numbers / digits.
  3. If you get any number with 2 digits, while doubling the alternate numbers in Step 2 (Provided above), then add those 2 digits together to make it as a single one. For example, if you doubled 6 to get 12. Make it 3 (By adding 2 and 1 – 2+1).
  4. Then add the uncrossed digits all-together.

If final sum ends as zero, then it is a valid credit card number, otherwise it is fake.

You can also check the demo-interaction as provided below, which shows the detection of a fake credit-card by the simple method as I told above.

If you get some problem while understanding this method, then post it in comment-box provided below.

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