Solve.The area code for a phone number in a city can be either 813 or 218. The rest of the 7-digit phone number can be formed with the digits 0 through 9. How many phone numbers can the city have before it needs to have another area code?

A. 20,000,000
B. 1,000,000
C. 18,000
D. 130,000


Answer: A

Mathematics

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