问道数学题~GWD6-32

sniperbill

If x is a positive integer, is the remainder 0 when (3^x
                + 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.

我觉得选A，答案是E

大家觉得呢？？谢谢啦~

Ethan0577

答案E，因为由  X=  1    2    3  4  5   6  7 8  9 10   11  

             3^x=  3    9    27 81 243 729     **29  .....    

所以当 X= 2,6,10,14..时才得证   所以选E

Ethan0577

数字没对应好，应该看得懂的

sniperbill

哦，谢谢啦~~原来是这样，我明白了，我前面弄错了个数字，如果x=4n+2就好啦~~