Answered: A password is a string of length 5,…

A password is a string of length 5, each character of which is from the set (x,y,z) of letters.How many possible passwords are there that use all three of these letters at least once?

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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Hi I have a question in my textbook that I am unsure about:

A password is a string of length 5, each character of which is from the set (x,y,z) of letters.How many possible passwords are there that use all three of these letters at least once?

How would I go about this? What is the answer?

Thank you

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