作者yihuac (a kitty likes a piggy)
看板GMAT
標題[計量] GWD4 Q5 ??
時間Thu Apr 3 19:10:09 2008
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!!!
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