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Mathematics 10 Online
OpenStudy (anonymous):

A numeric code consists of five digits. Each digit can be 0-9 except the first one, which can be any numeral except for zero. How many possible codes are there?

OpenStudy (anonymous):

first digit can be chosen in 9 ways, others in 10 ways. so, total 9*10*10*10*10 ways= 9*10^4 codes

OpenStudy (anonymous):

thanks for the help :)

OpenStudy (anonymous):

welcome :)

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