hahah2394 hahah2394

20-04-2020
Mathematics

contestada

To gain access to his account, a customer using an automatic teller machine (ATM) must enter a four-digit code. If repetition of the same four digits is not allowed (for example 5555), how many possible combinations are there?

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laniyahbaker10 laniyahbaker10

20-04-2020

I’m not really much sure, I tried.

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