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Mathematics 19 Online
OpenStudy (anonymous):

How many four digit numbers are there that contain at least one digit 3?

OpenStudy (anonymous):

I think the answer's 3168 o.o

OpenStudy (anonymous):

How did you get it? And you think?

OpenStudy (anonymous):

9*10*10*10 - 8 * 9*9*9 the total number of four digit numbers minus the ones that do not contain the digit three.

OpenStudy (anonymous):

Ok thanks! :D

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