VISA
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Example: 1234
6789
1234
6789
step 1: (1x2 + 3x2 + 6x2 + 8x2 + 1x2 + 3x2 + 6x2 + 8x2) = 2 + 6 + 12 + 16 + 2 + 6 + 12 + 16 = 2 + 6 + 1+2 + 1+6 + 2 + 6 + 1+2 + 1+6 = 36 step 2: 2 + 4 + 7 + 9 + 2 + 4 + 7 + 9 = 44 step 3: 36 + 44 = 80 The card number is valid. The sum is divisible by 10. |
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