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Mathematics 21 Online
OpenStudy (anonymous):

Kevin is registering at a Web site. He must select a password containing 6 numerals to be able to use the site. How many passwords are allowed if no digit may be used more than once?

OpenStudy (anonymous):

6!=720

OpenStudy (kropot72):

10P6 \[\frac{10!}{(10-6)!}\]

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