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SSSSS [86.1K]
3 years ago
8

Radio stations in a certain country use a sequence of 5 or 6 letters as their station identification call letters. The first let

ter 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?
Mathematics
1 answer:
liubo4ka [24]3 years ago
3 0
A is the answer to your question
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Answer:

(a)

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Imagine that you throw your coin and you get only heads, then you would stop when you get the first tail. So the probability that you stop at the fifth flip would be

p^4 (1-p)

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Imagine that you throw your coin and you get only tails, then you would stop when you get the first head. So the probability that you stop at the fifth flip would be

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(b)

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