SOLUTION: For some set, there are 720 possible permutations of the members of of that set taken 3 at a time. How many combinations of these three items are possible from the set?

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Question 922191: For some set, there are 720 possible permutations of the members of of that set taken 3 at a time. How many combinations of these three items are possible from the set?
Answer by richard1234(7193) About Me  (Show Source):
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Divide by 3! = 6 to get 120. This is because, order matters in permutations, so the six permutations ABC, ACB, BAC, BCA, CAB, CBA become one combination {A,B,C}.