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标题: GWD5-14 [打印本页]

作者: xiongxiong88 时间: 2005-8-26 06:27 标题: GWD5-14

GWD5-14不明白，请大家指教！

Q14:

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

这道题什么意思啊？答案是E

作者: xiongxiong88 时间: 2005-8-29 05:59

thanks !![em01]

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