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.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 40SE: A family consisting of 2 parents and 3 children is to pose for a picture with 2 family members in...
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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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