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Mathematics 9 Online
OpenStudy (anonymous):

How many different 4-letter words can be made a) if the first letter must be B, Y, P, or M and no letter may be repeated? b) if repeats are allowed (but the first letter is B, Y, P, or M)? c) How many of the 4-letter words (starting with B, Y, P, or M) with no repeats end in H?

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