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标题: 这道题我没思路,大家帮我看看,谢谢~~ [打印本页]

作者: taohuaxian    时间: 2010-2-3 19:44     标题: 这道题我没思路,大家帮我看看,谢谢~~

Q32:

If x is a positive integer, is the remainder 0 when (3x + 1)/10?

(1)   x = 3n + 2, where n is a positive integer.

(2)   x > 4

               

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.

作者: jedimin    时间: 2010-2-4 07:20

这个应该选E吧,首先(2)肯定不行,3的5,6,7,8次方后位数分别是3,9,7,1;加1后除10余数不确定。

(1)中当x=14时余数是0,但为5,8,11时都不是,所以也不行。

结合到一起还可以用上面数字举反例,所以也不行,只有选E


作者: jasminer    时间: 2010-2-5 21:48

E。 只有当X为2,6,10……公差为4时3^x 末尾为是9,最后remainder是0





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