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7 May, 00:43

Credit Cards have 16 digit numbers, of which the first 15 digits identify the credit card and the sixteenth digit is the check digit (the last digit is fixed). U-Kan-Trust-Us Credit Card numbers begin with 61, 62, or 63. What is the maximum number of credit cards that UKTU can issue?

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  1. 7 May, 01:53
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    The answer is B. 3 (10^13)
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