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OpenStudy (anonymous):
Please help! how many different social security numbers are possible? (a ss # consists of nine digits that can be repeated)
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OpenStudy (anonymous):
i know that the answer is \[10^{9}\]but not sure how to get that
OpenStudy (valpey):
10 possible digits for each place. 9 possible places. 10*10*10....*10 (do this nine times).
OpenStudy (anonymous):
why 10 though?
OpenStudy (valpey):
10 digits are possible (0,1,2,3,4,5,6,7,8,9)
OpenStudy (anonymous):
ohh ok. thank you!
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OpenStudy (valpey):
Cheers.
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