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30 March, 07:09

A security code consists of 9 digits (0-9), and a digit may not be used more than once. How many possible security codes are there?

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  1. 30 March, 07:32
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    Answer: 362880 (?)

    Step-by-step explanation:

    I believe this question is asking for a permutation, in which I plugged it into my graphing calculator as nPr (9,9) and got that answer.
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