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
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-> 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
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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?
