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OpenStudy (j.f):
How many different telephone area codes can be formed using the digits 0– 9, if 0 is not used for the first digit?
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OpenStudy (perl):
does that say 0 through 9
OpenStudy (j.f):
yes. Is it 10X10X10=1000?
OpenStudy (perl):
since 0 is not used for the first area code it should be 9x 10 x 10
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