How many possible ids are there in all what is the

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A computer system allows user IDs that are three, four, or five characters long. Repeated characters are allowed. The first character must be a lketter, but the other characters can either be letters or numbers. How many possible IDs are there in all? what is the probability that an ID chosen at random from all possible IDs has no repeated letters?

Reference no: EM13586864

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