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Mathematics 15 Online
OpenStudy (anonymous):

how many seven digit numbers are there when 0 and 5 cannot be the leading number

OpenStudy (campbell_st):

well that leaves 8 digits to fill the 1st position... then 10 for every other position Position: 1st 2nd 3rd 4th 5th 6th 7th 8 x 10 x 10 x 10 x 10 x 10 x 10 = just multiply it out

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