7. A system has the following requirement for its password: the password length be 6-8 charaters, every character should be a digit or a lower case letter, and the password should NOT beall digits. How many possible passwords are there?8. How many bit strings(strings of 1 or 0) of length 12 are there such that it contains exactly 41s?

We need to find the number of bit strings (strings of 1 or 0) of length 12 such that it contains…

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8. How many bit strings(strings of 1 or 0) of length 12 are there such that it contains exactly 4 1s?

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

7. A system has the following requirement for its password: the password length be 6-8 chara
ters, every character should be a digit or a lower case letter, and the password should NOT be
all digits. How many possible passwords are there?
8. How many bit strings(strings of 1 or 0) of length 12 are there such that it contains exactly 4
1s?

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