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Computer passwords are to consist of a string of six symbols taken from the digits 0,1,2, ... ,9 and the lower case letters a,b,c, ... ,z. How many computer passwords have repeated symbol?

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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Question

1. Computer passwords are to consist of a string of six symbols taken from the digits 0,1,2, ... ,9 and the lower case letters a,b,c, ... ,z. How many computer passwords have repeated symbol?

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