by 
Anonymous
ANSWERS: 7
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All of them
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Potentially nine (1-9) and if you include 0 as a number (though technically it is not), potentially 10.
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19 digits
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i have 16 on mines.
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16 digits. 9999 9999 9999 9999 being the highest number and 0000 0000 0000 0000 being the lowest. That gives each 'brand' of card 1 quadrillion (1,000 billion) customer numbers. That's enough cards for everyone on the planet to have 120 Visa cards.
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Visa & Master cards - 16 in the account number on the front... Plus 4 in the month & year is expires... sometimes there will be the first 4 numbers printed in ink under the account number... sometimes they have the month and year they issued it... then the back has the acct number again (16) plus the 3 digit code to verify you have the card in hand... plus phone numbers... that may be just a start if there is other information on the back. but 16 in the account number
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19 - 16 in the account number, and 3 in the expiration date.
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