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Each participant in a certain study was assigned a sequence

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Manager
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Each participant in a certain study was assigned a sequence [#permalink] New post 07 Sep 2005, 04:20
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A
B
C
D
E

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50. Each participant in a certain study was assigned a sequence of 3 different letters from the set {A, B, C, D, E, F, G, H}. If no sequence was assigned to more than one participant and if 36 of the possible sequences were not assigned, what was the number of participants in the study? (Note, for example, that the sequence A, B, C is different from the sequence C, B, A.)

I disagree with the OA!! help ??
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yes I guess 300 is right [#permalink] New post 07 Sep 2005, 05:16
yes I guess 300 is right.

The Number of distinct sequences is 8P3 that is equal to 336.Then substract 36.So the final Ans is 300.I guess
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 [#permalink] New post 07 Sep 2005, 09:08
Answer is 300

total number of possibilities : 8*7*6=48*7=336
36 of the possible sequences were not assigned so we are left with 336-36=300 possibilities
  [#permalink] 07 Sep 2005, 09:08
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Each participant in a certain study was assigned a sequence

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