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Mathematics 16 Online
OpenStudy (xmoses1):

How many permutations exist of the letters a, b, c, d taken three at a time? 24 12 4

OpenStudy (amistre64):

assuming without repetition? how many can you pick for the first position? how many does that leave for the next position? after thatis picked, then how many does that leave for the last position?

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