题目信息
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
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正确答案:
E:6 to 1
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