GWD-26-Q26

Q26:

When 15n, where n
is a positive integer, is divided by 6, the remainder is x.  What is the value of x?

(1)
            When
n is divided by 2, the remainder is 0.

(2)     When n is
divided by 3, the remainder is 0.

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:

怎么做啊，这题

            

是A不？

15=3*5，6=3*2

15n中如果有2这个factor，那么一定能被6整除，比如30, 60, 90

n是3的倍数不好说, 比如45, 90

题目就是 5n/2 余x

n/2余0，则5n/2一样

n/3余0，则不一定  n=奇数 x=1，n=30*a x=0