Mathematics, 30.04.2021 16:10, Asrys
Radio stations in a certain country use a sequence of 4 or 5 letters as their station identification call letters. The first letter must be X or K. Assume there are no restrictions on the remaining letters, and repetition is allowed. a) How many 4-letter station identifications are possible? b) How many 5-letter station identifications are possible? c) How many total station identifications are possible? d) The identification for a randomly-chosen radio station is 4 letters in length. What is the probability that all four letters are different?
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