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标题: GWD-4-5 [打印本页]

作者: Loli 时间: 2010-3-24 14:35 标题: GWD-4-5

Q5:
If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?
A. 5 to 4
B. 3 to 2
C. 2 to 1
D. 5 to 1
E. 6 to 1
求翻译，这题没看懂

作者: myice 时间: 2010-3-25 10:06

Q5:
If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B ...
Loli 发表于 2010-3-24 14:35

一串代码字由有序的从A,B,C,D,E,F,G,H,I,J 10个字母中选出的不同字母组成。问：由5个字母组成的代码字的个数和4个字母组成的代码字的个数的比率是多少？

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