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Question

An access code is a sequence of 4 letters from the alphabet. How many codes are possible (a) If repetition of letters is allowed? (b) If repetitions are not allowed? (c) If there is at least one repetition?

Solution

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Answered 2 years ago

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1 of 5The goal of this task is to answer to the following questions. It is known that an access code is a sequence of $4$ letters from the alphabet.

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