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B) A typical telephone number in the United States is of the form NXX NXX XXXX, where the Ns are digits other than 0 or 1 and the Xs are any digits. The first 3 digits constitute the area code. Find the minimum number of area codes needed to serve a 23-million-subscriber area.

B) A typical telephone number in the United States is of the form NXX NXX XXXX, where the Ns are digits other than 0 or 1 and the Xs are any digits. The first 3 digits constitute the area code. Find the minimum number of area codes needed to serve a 23-million-subscriber area.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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B) A typical telephone number in the United States is of the form NXX NXX XXXX, where the Ns are digits other than 0 or 1 and the Xs are any digits. The first 3 digits constitute the area code. Find the minimum number of area codes needed to serve a 23-million-subscriber area.
Transcribed Image Text:B) A typical telephone number in the United States is of the form NXX NXX XXXX, where the Ns are digits other than 0 or 1 and the Xs are any digits. The first 3 digits constitute the area code. Find the minimum number of area codes needed to serve a 23-million-subscriber area.
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