标题: GWD求助，偶觉得这道题的答案都不对~~ [打印本页]
作者: reginaer 时间: 2009-3-1 10:01 标题: GWD求助，偶觉得这道题的答案都不对~~
A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetic order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?
作者: xueguelili 时间: 2009-3-1 18:50
這題是5个哦～随便假设这5个字母是a,b,c,d,e( no repeat),按题目要求这里就14种，而如果是4个字母的话，比如a,b,c,d，那么算出来就只有10种，所以5是least number啊？另外mm，你给我短信里说的题目是哪题哦？
作者: reginaer 时间: 2009-3-2 07:19
我总是想着算出来要等于12，嗨，谢谢：）
我以为你问这个题目呢：
In the figure shown, the circle has center O and radius 50, and point P has coordinates (50,0). If point Q (not shown) is on the circle, what is the length of line segment PQ ?
(1) The x-coordinate of point Q is – 30.
(2) The y-coordinate of point Q is – 40.
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