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An automated teller machine (ATM) requires a four-digit personal identification number (PIN), using the digit 0-9. (the first digit may be zero) How many such
An automated teller machine (ATM) requires a four-digit personal identification number (PIN), using the digit 0-9. (the first digit may be zero) How many such PINs have repeated digits?
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Number of different PINs 10 10 10 ...
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