7. A password on a certain site must be five characters long, made from letters of the alphabet, and have at least one upper case letter. How many different passwords are there? What if there must be a mix of upper and lower case?

7. A password on a certain site must be five characters long, made from letters of the alphabet, and have at least one upper case letter. How many different passwords are there? What if there must be a mix of upper and lower case?

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

7. A password on a certain site must be five characters long, made from letters
of the alphabet, and have at least one upper case letter. How many different
passwords are there? What if there must be a mix of upper and lower case?

Expert Solution

Step 1

If selection is to be done without repetition then the total will be reduced at each selection.

If selection is to be done with repetition then the total will be the same at each selection.

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