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23 June, 16:10

To use an automated teller machine (ATM), a customer must enter his or her four-digit Personal Identification Number (PIN). How many different PINs are possible?

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  1. 23 June, 17:42
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    10000 possible PINs.

    Explanation:

    Considering the fact that only numbers are permitted (0 - 9) which gives 10 characters and also that the digits can be repeated, the total number of possible PINs that are possible is 10 x 10 x 10 x 10 = 10000
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