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20 January, 07:33

To use your debit card at a pay-at-the-pump system, you have to enter a four-digit personal identification number (PIN). How many different possible PINs can be formed on the 10-digit keypad? (Repetition is not allowed.)

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  1. 20 January, 11:16
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    Answer is 5040

    10*9*8*7=5040
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