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6
It will contain at least 12 digits
04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
no, it matters with the number not digits
Most credit cards in the United States contain 16 digits broken into four groups of four digits. American Express cards contain 15 digits, however.