-
artstudent
- Senior | Next Rank: 100 Posts
- Posts: 62
- Joined: Mon Mar 28, 2011 9:35 pm
- Thanked: 4 times
diff. inequalities
This topic has expert replies
Source: Beat The GMAT — Data Sufficiency |
-
gmatboost
- Master | Next Rank: 500 Posts
- Posts: 312
- Joined: Tue Aug 02, 2011 3:16 pm
- Location: New York City
- Thanked: 130 times
- Followed by:33 members
- GMAT Score:780
This question has definitely been asked pretty recently. Search for 2b-a or something similar.
Greg Michnikov, Founder of GMAT Boost
GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.
Also, check out the most useful GMAT Math blog on the internet here.
GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.
Also, check out the most useful GMAT Math blog on the internet here.
from statemen1: a<b, consider a =1 and b = 2 ... then we have 0 > infinity ..artstudent wrote:if a is not equal to 2b, Is (2a-b)/(2b-a)> (2b-a)/(2a-b)?
1) a<b
2) 2a<b
and consider a = -2 and b = -1... then we have infinity > 0... not sufficient!
from statement2: 2a<b, consider a = 2 and b = 5...then we have -1/8 > -8 ...
also consider a = 0 and b = 1... then we have -1/2 > -1...
a = -1 and b = -1.... then we have 1 > 1 ..not determined..
hence not sufficient.
if you combine: a <b and 2a<b, ..consider a = -1 and b = 0 ...thenwe have -2 > -1/2..not possible! also..a = 0 and b = 1... then we have -1/2 > -1...possible!
clearly even this is not sufficient.
ANs: E!
