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How many different area codes were possible under these old rules?

How many different area codes were possible under these old rules?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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31. Please answer this question and please show every step. Please make sure to let me know if it’s permutation or combination, and to always start off with the formula when showing the work. The problem may not need permutation or combination though.
lock with the first try? 31. Finding the Number of Area Codes USA Today reporter Paul Wiseman described the old rules for the three-digit telephone area codes by writing about "possible area codes with 1 or 0 in the second digit. (Excluded: codes ending in 00 or 11, for toll-free calls, emergency services, and other special uses.)" Codes beginning with 0 or 1 should also be excluded. How many different area codes were possible under these old rules?
Transcribed Image Text:lock with the first try? 31. Finding the Number of Area Codes USA Today reporter Paul Wiseman described the old rules for the three-digit telephone area codes by writing about "possible area codes with 1 or 0 in the second digit. (Excluded: codes ending in 00 or 11, for toll-free calls, emergency services, and other special uses.)" Codes beginning with 0 or 1 should also be excluded. How many different area codes were possible under these old rules?
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