Mathematics, 27.02.2021 22:40, pbarbee3034

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?

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