疑问 OG12 Data Sufficiency 128.

thunder079

A school administrator will assign each student in a group of n students 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 m classrooms 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 m classrooms so that each classroom has the same number of students assigned to it.

答案B 怎么解也明白
但是 题干问is it possible, 这个时候怎么选答案？ （1）的条件不能推出任何情况都成立 但是可以推出有的时候可以,及possible。 但是看答案我这么想是错的。（不一定成立 就不是possible?)
那么以后看到这么问的问题 也都用这个思路答吧？
请哪位帮忙确认一下。

sdcar2010

This question is more like a CR question.  In essence, the stimulus asks you that if you use condition 1 or 2 or both as premise(s), can you reach the conclusion "it is 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."

evanwow

Data Sufficiency 所要的答案
(以条件(1)举例)
要判断条件(1)是否"成立"
必须将条件(1)代入题目求得"唯一"答案
而不是判断代入后的答案为 "是or不是"
好比说有个题目问 "X是否大于0?"
条件(1)带入 所有符合条件(1)的X皆小于0(唯一答案)
不会是 有时小于零有时大于零
所以条件(1)"成立"
就LZ的题目 你也知道 不一定成立=>有时成立有时不成立
所以不能选