作者littlestupi (讓我夢想成真吧M)
看板GMAT
標題Re: [計量] GWD4 Q5 ??
時間Thu Apr 3 19:17:54 2008
※ 引述《yihuac (a kitty likes a piggy)》之銘言：
: If a code word is defined to be a sequence of
: defferent 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?
: Ans:E. 6 to 1
: 求解??? 怎算的勒???
: 謝謝!!!
5-letter code: 10*9*8*7*6 種
4-letter code: 10*9*8*7 種
ratio: 5-letter/4-letter = 6/1
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