A password has a length of four letters of the 26 in the English alphabet. If the password only has uppercase or lowercase letters, determine how many different passwords can be created. If we could not repeat letters how many different passwords could be created.

A password has a length of four letters of the 26 in the English alphabet. If the password only has uppercase or lowercase letters, determine how many different passwords can be created. If we could not repeat letters how many different passwords could be created.

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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Question

I asked this before but wrong answer. There will be two answer(one repeated and one non repeated letters). Please do it correctly. I will rate accordingly with 3-4 votes.

A password has a length of four letters of
the 26 in the English alphabet. If the
password only has uppercase or lowercase
letters, determine how many different
passwords can be created. If we could not
repeat letters how many different
passwords could be created.

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