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一道GWD DS 问题


这道题是猜对的,不知怎么推理。

谢谢指教!!!

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. BOTH statements TOGETHER are sufficient, but NEITHER

statement ALONE is sufficient.

D. EACH statement ALONE is sufficient

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

Answer: B

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m能被3n整除,有可能是m被n整除,也有可能不行:比如:m=6, n=14;

m能被13n整除,因为3<m<13,因此m中不可能有13的因子,那么m必然能被n整除

TOP

thanks&nbsp; a&nbsp; lot !!!!

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