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OpenStudy (anonymous):
A Social Security number has nine digits, using the digits 0 through 9 with repetition of digits allowed. How many Social Security numbers have at least one repeated digit?
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OpenStudy (paxpolaris):
Social Security numbers with at least one repeated digit = All possible numbers - all numbers with no repeated digits \[\Large=10^9 - 10!\]
OpenStudy (paxpolaris):
= 996,371,200
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