DIVISIABLE的题...好混乱

scorpio2rd

Q11:

If n and k are positive integers, is n divisible by 6?

(1)     n = k(k + 1)(k - 1)

(2)     k – 1 is a multiple of 3.

                  

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.

我选C, 答案是A

我决的这种DIVISIBLE的题特别的郁闷....都不知道怎么做.......

casforain

被6整除关键是要被2＊3整除，

n=1*2*3/2*3*4/3*4*5/4*5*6/5*6*7/6*7*8/7*8*9...越到后面，包含的2和3越多