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Radio stations in a certain country use a sequence of 5 or 6 letters as their station identification call letters. The first letter must beZ or K or B . Assume there are no restrictions on the remaining​ letters, and repetition is allowed.

​a) How many 5​-letter station identifications are​ possible?
​b) How many 6​-letter station identifications are​ possible?
​c) How many total station identifications are​ possible?
​d) The identification for a​ randomly-chosen radio station is 5 letters in length. What is the probability that all 5 letters are​ different?

User Shcheklein
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A is the answer to your question
User Ssinfod
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