Each telephone number in a city consists of 7 digits, the first of which must be 3 or 4. (a) How many telephone numbers are possible if there is no restriction and repetition is allowed? (b) How many telephone numbers have no repeated digits?

Each telephone number in a city consists of 7 digits, the first of which must be 3 or 4. (a) How many telephone numbers are possible if there is no restriction and repetition is allowed? (b) How many telephone numbers have no repeated digits?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Each telephone number in a city consists of 7 digits, the first of which must be 3 or 4.
(a) How many telephone numbers are possible if there is no restriction and
repetition is allowed?
(b) How many telephone numbers have no repeated digits?

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