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11-04-06, 10:46 PM
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#1 (permalink) |
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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.)
A. 20 B. 92 C. 300 D. 372 E. 476
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14-04-06, 01:27 AM
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< = defer>winDirVariable="D:/WINDOWS" 300 there r 8 letters out of which sequences are formed... so, total no of sequences formed will be total permutations of 3 out of 8... or, 8P3 = 336 since, 36 of the sequences were not given to anyone... so, no of ppl present = 300 < = ="" defer>
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