Telephone number in the unites states and Canada have 10 digits as follows :
i, 3-digit area code number, whose first digit cannot be 0 or 1
ii, 3-digit exchange number, whose first two digits cannot be 0 or 1.
iii 4-digit line number, whose digits cannot be all 0
a, how many area codes are possible?
b, how many 7-digit phone number are possible within the 617 area code
c, how many phone numbers are possible in the united states and Canada
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