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标题: GWD11-6 [打印本页]

作者: xiaochan1982    时间: 2005-12-24 12:28     标题: GWD11-6

题目是这样的

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,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

B3 to 2

C2 to 1

D5 to1

E6 to 1

答案是E

我连题目都不知道在说什么


作者: xiaochan1982    时间: 2005-12-26 20:57

xie   xie  !!!




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