← Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1 and the third digit could not be 2. Complete parts (a) and (b) below. (...) (a) How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.) There are area codes possible. (Type a whole number.)
← Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1 and the third digit could not be 2. Complete parts (a) and (b) below. (...) (a) How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.) There are area codes possible. (Type a whole number.)
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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![**Area Code Restrictions and Telephone Number Calculation**
Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1, and the third digit could not be 2. Complete parts (a) and (b) below.
---
**(a)** How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.)
There are [ ] area codes possible.
(Type a whole number.)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8b332b36-1ae1-45b9-a16d-399dae5f6244%2F3596b52d-cb77-40e8-81fd-16562c1fb792%2F7sadv6j_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Area Code Restrictions and Telephone Number Calculation**
Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1, and the third digit could not be 2. Complete parts (a) and (b) below.
---
**(a)** How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.)
There are [ ] area codes possible.
(Type a whole number.)
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