How many different 5​-letter words can be made:   a.  if the first letter must be C, Y, or T and no letter may be​ repeated?   b.  if repeats are allowed​ (but the first letter is C, Y, or T​)?   c.  How many of the 5​-letter words​ (starting with C, Y, or T​) with no repeats end in S​?

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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How many different 5​-letter words can be made:
 
a.  if the first letter must be C, Y, or T and no letter may be​ repeated?
 
b.  if repeats are allowed​ (but the first letter is C, Y, or T​)?
 
c.  How many of the 5​-letter words​ (starting with C, Y, or T​) with no repeats end in S​?
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