How many different 5​-letter radio station call letters can be made a.  if the first letter must be C or X and no letter may be​ repeated? b.  if repeats are allowed​ (but the first letter is C or X​)? c.  How many of the 5​-letter radio station call letters​ (starting with C or X​) have no repeats and end with the letter R​?

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 8ECP: In how many different ways can two letters be chosen from the letters A, B, C, D, E, F, and G? (The...
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How many different
5​-letter
radio station call letters can be made
a.  if the first letter must be
C or X
and no letter may be​ repeated?
b.  if repeats are allowed​ (but the first letter is
C or X​)?
c.  How many of the
5​-letter
radio station call letters​ (starting with
C or X​)
have no repeats and end with the letter
R​?
 
 
 
a.  If the first letter must be
C or X​,
and all the letters in the radio station call letters must be​ different, then there are
nothing
5​-letter
radio station call letters.
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