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Mathematics 14 Online
OpenStudy (anonymous):

How many different social security numbers are there with distinct digits assuming 0 cannot be the first digit? ( SS#'s have 9 digits)

OpenStudy (anonymous):

distinct digits? so repetition is not allow?

OpenStudy (lucaz):

oh, yeah, sorry!

OpenStudy (anonymous):

9 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2

OpenStudy (lucaz):

so it should be 9 * (9P8) ?

OpenStudy (anonymous):

yea

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