Questions tagged [hacker1]

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hacker1 - credit - Problems on some card numbers

The logic from hacker1: Multiply every other digit by 2, starting with the number's second-to-last digit, and then add those products' digits together. Add the sum to the sum of the digits ...
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Credit Card Test Confusion

I am supposed to find if cc numbers are valid based on these rules: Multiply every other digit by 2, starting with the number’s second-to-last digit, and then add those products' digits together. ...