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?
Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter14: Counting And Probability
Section14.CT: Chapter Test
Problem 3CT: An Internet service provider requires its customer to select a password consisting of four letters...
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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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