My answer does not agree with OA :P

Expert replies

rohangupta83: Legendary Member; Posts: 541; Joined: Thu May 31, 2007 6:44 pmFollowed by: 3 members; Location: UK; Thanked: 21 times; GMAT Score:680

by rohangupta83 » Thu Nov 27, 2008 9:53 am

What is the value of v^3 – k^3?
(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.

I've tried everything but I'm unable to get the right answer. I'll post the OA after some discussions.

Last edited by rohangupta83 on Thu Nov 27, 2008 2:39 pm, edited 1 time in total.

Source: Beat The GMAT — Data Sufficiency | Thu Nov 27, 2008 9:53 am

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Thu Nov 27, 2008 10:08 am

Is the question value of (v^3-k^3)?

I see multiple values for v and k that satisfy the 2 statements independently and together. I must be missing something here....

a^3-b^3 = (a-b) (a^2+b^2+ab)

Still there is lot of missing info since we dont know the value of (a^2+b^2+ab) nor a or b

Please confirm the question if possible. I am going wiht E) with the question as is

rohangupta83: Legendary Member; Posts: 541; Joined: Thu May 31, 2007 6:44 pmFollowed by: 3 members; Location: UK; Thanked: 21 times; GMAT Score:680

by rohangupta83 » Thu Nov 27, 2008 2:40 pm

I've corrected the question

My answer was E as well - OA was B. I had no idea how they got it. Just wanted to get a second opinion.

logitech: Legendary Member; Posts: 2134; Joined: Mon Oct 20, 2008 11:26 pmFollowed by: 25 members; Thanked: 237 times; GMAT Score:730

by logitech » Thu Nov 27, 2008 3:02 pm

rohangupta83 wrote:I've corrected the question

My answer was E as well - OA was B. I had no idea how they got it. Just wanted to get a second opinion.

Rohan, I would not waste my time to understand why a BOGUS OA states an illogical result.

V=7, K=1 v-k = 6 and the result is 342

v=8, K=2 v-k - 6 and the result is NOT 342!

So the answer can not be B.

Choose E.

LGTCH
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