[求助]gwd-17-26

detectiveyan

Q26:

If n is a positive integer, what is the value of n ?

(1) When n is divided by 3, the remainder is 2.

(2) When n² is divided by 3, the remainder is 1.

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.

仔细的找了讨论链接,没有这个题目,是不是跟前面的题目是重复的呢?

答案给的是c.但是我觉得5和8都符合条件啊,选e更好吧.请指教~~

himba

支持选E,不仅是5、8，11、14都是这样的。其实（1）和（2）就是一个意思。

因为令n=3m+2,m为非负整数。则n^2=(3m+2)^2=9m^2+12m+4，这个数除3就是余1啊。