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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)
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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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