Solved: How many direct-dialing numbers for calls within the united, Mathematics

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How many direct-dialing numbers for calls within the united

Question: TELEPHONE NUMBERS

a. How many seven-digit telephone numbers are possible if the first digit must be nonzero?

b. How many direct-dialing numbers for calls within the United States and Canada are possible if each number consists of a 1 plus a three-digit area code (the first digit of which must be nonzero) and a number of the type described in part (a)?

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Mathematics: How many direct-dialing numbers for calls within the united

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