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标题: 请教大家一道数学题 [打印本页]

作者: youngerlee 时间: 2010-12-7 07:06 标题: 请教大家一道数学题

Q28:

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.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTHstatements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

我怎么觉得这两个condition都行啊？

作者: rudder86 时间: 2010-12-7 21:06

这题的答案，取决于3n、m、13n有没有公约数，如题所设是有的。比如m=6或者m=9时，就和3n有公约数。因此只有条件2是充分的，条件1不充分。

举例：m=6，n=22，则3n=66，可以被平均分配到6个房间，但22个学生不能被平均分配。

作者: MarilynR 时间: 2010-12-9 20:08

请看OG12， DS题128

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