In a certain country license plates consist of zero or one digitfollowed by four or five uppercase letters from the Romanalphabet.
(a)
How many different license plates can the country produce?
(b)
How many license plates have no repeated letter?
(c)
How many license plates have at least one repeated letter?
(d)
What is the probability that a license plate has a repeatedletter? (Round your answer to the nearest whole percent.)
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