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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?

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?
asked 159k views
4 votes
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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User Pagan
by
7.7k points

2 Answers

2 votes

Answer: 362880 (?)

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.

answered
User Scott Roepnack
by
9.0k points
4 votes

Answer:

a

Explanation:

answered
User Turnerm
by
7.5k points
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