GWD16-Q7~求助NN啦~

evelyn205205 · 发表于 2011-7-29 14:20:44

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.

答案是B。
不知道该怎么入手，望NN相助，谢谢啦~

guosimonqq · 发表于 2011-7-29 14:40:32

你读懂题目没有？题目就是问能不能把n个学生放入m个教室并且人数相同。其实就是问n能不能被m整除了、、、条件1是说3n能被m整除，条件2是说13n能被m整除。条件1不行，例如n=22，m=6，不满足。。。条件2是行的，因为13是质数而m又小于13，只能n被m整除！所以B！

wmc638963 · 发表于 2011-7-29 14:48:37

我做了个E。我错了。求指教。多谢

evelyn205205 · 发表于 2011-7-29 14:51:52

你读懂题目没有？题目就是问能不能把n个学生放入m个教室并且人数相同。其实就是问n能不能被m整除了、、、条件1是说3n能被m整除，条件2是说13n能被m整除。条件1不行，例如n=22，m=6，不满足。。。条件2是行的，因为13是质数而m又小于13，只能n被m整除！所以B！

-- by 会员 guosimonqq (2011/7/29 14:40:32)

谢谢你，恍然大悟！

evelyn205205 · 发表于 2011-7-29 14:52:22

我做了个E。我错了。求指教。多谢

-- by 会员 wmc638963 (2011/7/29 14:48:37)

看二楼的解释吧~~~

wmc638963 · 发表于 2011-7-29 14:57:51

恩，明白自己错哪了。多谢！

GWD16-Q7~求助NN啦~

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