Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

Value of K

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 67
Joined: Sat Feb 16, 2008 8:07 pm
Location: Philippines
Thanked: 3 times
by fighting_cax » Mon Feb 23, 2009 2:46 pm
see attached image[/img]
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16206
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Mon Feb 23, 2009 4:42 pm
The question "Is 1/k > 0" can be rewritten as "is k positive?" since the only way for 1/k to be greater than 0 is for k to be positive.

(1) If 1/(k-1) is positive, then k-1 is positive: 0<k-1
Add 1 to both sides: 1<k
k is definitely positive
SUFF

(2) If 1/(k+1) is positive, then k+1 is positive: 0<k+1
Subtract 1 from both sides: -1<k
k can be either positive or negative.
INSUFF

The answer is A
Last edited by Brent@GMATPrepNow on Mon Feb 23, 2009 8:11 pm, edited 2 times in total.
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 137
Joined: Thu Jan 08, 2009 1:27 am
Thanked: 7 times

by welcome » Mon Feb 23, 2009 6:25 pm
same as Brent , I'll go for A. what is OA.
Shubham.
590 >> 630 >> 640 >> 610 >> 600 >> 640 >> 590 >> 640 >> 590 >> 590
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 258
Joined: Thu Aug 07, 2008 5:32 am
Thanked: 16 times

Re: Value of K

by x2suresh » Mon Feb 23, 2009 7:57 pm
Agree with Brent A.
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 67
Joined: Sat Feb 16, 2008 8:07 pm
Location: Philippines
Thanked: 3 times

by fighting_cax » Thu Feb 26, 2009 2:35 pm
Thanks Brent - your explanation is very clear.
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 229
Joined: Tue Jan 13, 2009 6:56 am
Thanked: 8 times
GMAT Score:700

by Uri » Thu Feb 26, 2009 3:57 pm
Brent Hanneson wrote: (2) If 1/(k+1) is positive, then k+1 is positive: 0<k+1
Subtract 1 from both sides: -1<k
k can be either positive or negative.
INSUFF

The answer is A

From (2), we know that k>-1. And we are told explicitly that k is not 0, 1 or -1. Thus combining this two, k>1. Hence (2) should also be sufficient.

Please rectify me if I have made any mistake.
Top
Join the discussion
Newbie | Next Rank: 10 Posts
Posts: 9
Joined: Fri Sep 14, 2007 4:58 am

by rolrol19 » Sun Mar 01, 2009 2:00 pm
Agree with Uri!
Top
Join the discussion
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Sun Mar 01, 2009 3:39 pm
From (2), we know that k>-1. And we are told explicitly that k is not 0, 1 or -1. Thus combining this two, k>1. Hence (2) should also be sufficient.

Please rectify me if I have made any mistake
Agree with Uri!
A common mistake is to assume k is an integer. The problem states k is not 0,1 or -1 so it can be anything else(integer or fraction)


Stmt II

1/k+1 > 0

k= - 1/2 still 1/k+1 > 0 and 1/k is not greater than 0



Hope this helps!

Regards,
CR
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 229
Joined: Tue Jan 13, 2009 6:56 am
Thanked: 8 times
GMAT Score:700

by Uri » Mon Mar 02, 2009 1:41 pm
thanks, cramya! understood my mistake
Top
Join the discussion