gwd 2-gmat-4

lukrenee

Q4:

What is the value of v³ – k³?

(1)     v k > 0

(2)     v – k = 6

                  

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.

为何答案是E？1+2得

Answer: (v-k)^3=v^3-k^3-3k v^2+3vk^2

6^3=v^3-k^3-3vk(v-k)

v^3-k^3=6^3+3vk(v-k)

v^3-k^3=6^3+18vk

大于0，选C

robertchu

wrong board -- this is logic board :-)