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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?
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OpenStudy (amistre64):
how many letters are there to choose from?
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