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OpenStudy (anonymous):
A typical Social Security number is 555-47-5593. How many Social Security numbers are possible if the first two digits cannot be 0?
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OpenStudy (a_clan):
9*9*10*10*10*10*10*10*10
OpenStudy (anonymous):
How did you get the 10 10 10 10 10 10 10???
OpenStudy (anonymous):
Nevermind!!! I understand now hahah! Thank you!
OpenStudy (a_clan):
first two digits can be any number from 1 to 9 rest all digits can be any number from 0 to 9
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