How do credit card companies not run out of numbers?
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When there are 16 digits x 10 possibilities for each digit, that’s over a trillion numbers… even with the first number being limited to only 4-5 numbers (it defines what card network, ie .Visa, mastercard, Amex, etc) that’ still many billions of numbers. And they can always re-use numbers after a period of inactivity. New expiration dates and CVV codes would prevent misuse of old, expired numbers.
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