Every subsequent digit on the credit card but the very last is your account number. A credit card has a maximum of 19 digits, though most use 16, meaning that there are typically 9-12 digits utilized for account numbers. Mathematically, this means that there are 10**9 possible account numbers, or a billion possible combinations. If the card issuer used 12 digits, that'd be 10**12 or 1,000,000,000 000 combinations. That's a lot of possibilities!
Tuesday 17 May 2011
Credit Card
Every subsequent digit on the credit card but the very last is your account number. A credit card has a maximum of 19 digits, though most use 16, meaning that there are typically 9-12 digits utilized for account numbers. Mathematically, this means that there are 10**9 possible account numbers, or a billion possible combinations. If the card issuer used 12 digits, that'd be 10**12 or 1,000,000,000 000 combinations. That's a lot of possibilities!
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