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Mathematics 13 Online
OpenStudy (anonymous):

3. How many different 4-letter radio station call letters can be made if (a) the first letter must be K or W and no letter may be repeated? (b) repeats are allowed, but the first letter is K or W? (c) the first letter is K or W, there are no repeats, and the last letter is R?

OpenStudy (amistre64):

how many letters are there to choose from?

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