SOLUTION: Radio stations in the U.S. have call letters that begin with K or W. Some have a total of 3 letters; others have a total of 4 letters. (a) How many sets of 3-letter call letter

Question 709566: Radio stations in the U.S. have call letters that begin with K or W. Some have a total of 3 letters; others have a total of 4 letters.
(a) How many sets of 3-letter call letters are possible if:

(i) the last two letters can be repeated?

(ii) the last two letters cannot be repeated?

(b) How many sets of 4-letter call letters are possible if:
(i) the last three letters can be repeated?

(ii) the last three letters cannot be repeated?

Answer by vheroli(126) (Show Source): You can put this solution on YOUR website!
a)
i. 2*26*26=1352
ii. 2*25*24=1200
b)
i. 2*26*26*26=35152
ii. 2*25*24*23=27600
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