Count the number of arrangements of 5 distinct letters of the alphabet such that * the letters b, d, m, w, z are not used and * if the letter c is the first letter in the arrangement m, then the letter a is second and the letter t is third
Count the number of arrangements of 5 distinct letters of the alphabet such that * the letters b, d, m, w, z are not used and * if the letter c is the first letter in the arrangement m, then the letter a is second and the letter t is third
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
Count the number of arrangements of 5 distinct letters of the alphabet such that
* the letters b, d, m, w, z are not used and
* if the letter c is the first letter in the arrangement m, then the letter a is second and the letter t is third
Expert Solution
Step 1
Introduction:
The English alphabet contains 26 letters. Of these, the 5 letters b, d, m, w, and z are not to be used here.
Thus, the total number of letters that can be used in this arrangement is, 26 – 5 = 21.
The rest of the problem uses only these 21 permissible letters, ignoring the 5 that cannot be used.
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