GWD-4-5

Loli

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

myice

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？