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标题: GWD 5-14 [打印本页]

作者: bfghdggf 时间: 2004-12-20 13:13 标题: GWD 5-14

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

MINE D

ANS E

怎么也不明白啊

作者: himba 时间: 2004-12-20 13:16

P(10,5)/P(10,4) = 10 * 9 * 8 * 7 * 6 /(10 * 9 * 8 * 7) = 6:1

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