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标题: GWD中第13套-3 [打印本页]

作者: excellences 时间: 2005-7-16 08:16 标题: GWD中第13套-3

Q3:

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

题目看不懂。。。

解释下好么？？感激ing

作者: himba 时间: 2005-7-16 16:24

从8个字母中任取3个不同排序，有36种已排掉，问剩下多少种？
P8,3－36＝336－60＝300
选D。

作者: moderation 时间: 2005-7-17 08:31

agree!!!!

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