Is the following Credit Card Number Valid or Invalid 4678-2012-7421-4784?
Valid
Invalid; d =...
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Mathematics, 01.03.2021 01:00, KetaFord1978
Is the following Credit Card Number Valid or Invalid 4678-2012-7421-4784?
Valid
Invalid; d = 1
Invalid; d = 7
O Invalid; d = 9
![answer](/tpl/images/cats/otvet.png)
Answers: 2
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