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OpenStudy (alissaby):
Find the number of 9-digit social security numbers if the digits may be repeated. I want to say its 90 or 10,000,000,000 but im not sure.
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OpenStudy (anonymous):
(10)^9
OpenStudy (alissaby):
ok so it is 10,000,000,000?
OpenStudy (anonymous):
should be 9 zeros in my opinion
OpenStudy (anonymous):
not 10
OpenStudy (alissaby):
ok
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