Seudónimo Seudónimo

05-04-2017
Mathematics

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Find the number of possible choices for a 2-digit number that is greater than 19. Then find the number of possible choices for a 4-digit Personal Identification Number (PIN) if the digits cannot be repeated.

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Аноним Аноним

05-04-2017

The answer to the first question is 19-99, so it's 80. The answer to the second question is 60 (I think)

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