作者yihuac (a kitty likes a piggy)
看板GMAT
标题[计量] GWD4 Q5 ??
时间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???
谢谢!!!
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 59.112.171.210