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标题: [求助]请教一道数学题（这个题是怎么回事啊） [打印本页]

作者: dongziyuan 时间: 2007-12-18 11:31 标题: [求助]请教一道数学题（这个题是怎么回事啊）

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

作者: shawlen 时间: 2007-12-20 12:36

P105/P104,选E

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