Solution Found!
For years, telephone area codes in the United States and
Chapter 1, Problem 5P(choose chapter or problem)
Problem 5P
For years, telephone area codes in the United States and Canada consisted of a sequence of three digits. The first digit was an integer between 2 and 9, the second digit was either 0 or 1, and the third digit was any integer from 1 to 9. How many area codes were possible? How many area codes starting with a 4 were possible?
Questions & Answers
QUESTION:
Problem 5P
For years, telephone area codes in the United States and Canada consisted of a sequence of three digits. The first digit was an integer between 2 and 9, the second digit was either 0 or 1, and the third digit was any integer from 1 to 9. How many area codes were possible? How many area codes starting with a 4 were possible?
ANSWER:
Step 1 of 3
Telephone area codes in the United States and Canada consisted of a sequence of three digits.
The first digit between 2 and 9 ( 8 digits).
The second digit is either 0 or 1( 2 digits).
The third digit between 1 and 9 ( 9 digits).
The claim is to find the number of possible area codes and the number of area codes starting with a 4 was possible.