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OG12 Data Sufficienty 128

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楼主
发表于 2011-8-7 19:10:43 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
A school administor will asign each student in a group of n student to one of m classrooms.if 3<m<13<n, is it possible to assign each of the n students to one of the m classrooms so that each classroom has the same number of students assigned to it?
1.It is possible to assign each of 3n students to one of the classroom so that each classroom has the same number of students assigned to it
2.It is possible to assign each of 13n students to one of the classroom so that each classroom has the same number of students assigned to it


答案是B。  但是OG解答中 A选项忽略3<m<13<n这个条件了。如果按照这个条件,答案应该选D。求教我是不是哪里搞错了?
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沙发
 楼主| 发表于 2011-8-7 20:30:55 | 只看该作者
求解答……
板凳
发表于 2011-8-7 20:47:37 | 只看该作者
刚找的。自己想错了,穷举就行
3<M<13<N
其中6 因子有3 , 2
舉個例子
IF N=14 , M=6  , 14X3=42 , 42可被6整除
BUT 14無法被6整除
IF N=18 , M=6 ,18X3=54 54跟18都可被6整除
两种结果,所以A错
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