In one portion of a city, a telephone number begins with 381, 383 or 385, followed by
Chapter 8, Problem 5(choose chapter or problem)
In one portion of a city, a telephone number begins with 381, 383 or 385, followed by four digits. (a) How many such telephone numbers are possible? (b) How many such telephone numbers have no digits repeated?
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer