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标题: GWD-4-5 [打印本页]

作者: bipedalisms 时间: 2006-4-24 04:40 标题: GWD-4-5

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

How to solve this?

作者: liuxiaolan89 时间: 2006-4-25 20:21

我也不知道，请指点～！！！

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