BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Absolute value & Inequality

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 54
Joined: Wed Mar 10, 2010 6:11 am
Thanked: 1 times

by suryapal » Fri Apr 02, 2010 10:02 am
my answer is E ... is it ???
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Fri Apr 02, 2010 10:27 am
boazkhan wrote:Is |a| + |b| > |a + b| ?

(1) a^3 > b^3

(2) b < 0
Step 1 of the Kaplan Method for DS: Analyze the Stem

When will the left side be greater than the right side?

Well, if a and b have the same sign, then the two sides will be equal.

If a and b have different signs, then the right side will be bigger.

So, here's the real question:

Do a and b have the same sign?

(1) a and b could both be positive or a could be positive and b negative: insufficient.

(2) nothing about a: insufficient.

Together: they could both be negative or a could be positive and b negative: still insufficient, choose E.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Master | Next Rank: 500 Posts
Posts: 135
Joined: Tue Oct 13, 2009 10:27 am
Thanked: 3 times

by boazkhan » Fri Apr 02, 2010 1:11 pm
Thanks Stuart!
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Fri Jun 25, 2010 9:14 pm
Minor edit (thanks to viidyasagar) for noticing:

if the signs are different, the left side will be bigger, not the right side (the solution is the same).
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Post new topic Post Reply
• Page 1 of 1