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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Interger DS

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
Master | Next Rank: 500 Posts
Posts: 385
Joined: Sun May 24, 2009 3:55 pm
Thanked: 11 times
GMAT Score:740

by Domnu » Sat Jun 06, 2009 2:07 pm
I don't think that's correct... (2) can be solved all by itself. We see that n = 3 works. Now, if you go to n = -1, -2, -3, ... the lhs gets smaller, and for n = 4, 5, 6, the lhs gets a lot bigger. So the only solution to (2) is n = 3.

So (2) is sufficient but (1) alone isn't... particularly (1)'s solution can either be -5 or 3.
Have you wondered how you could have found such a treasure? -T
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1161
Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member
Location: Sydney
Thanked: 23 times

by mehravikas » Sat Jun 06, 2009 8:26 pm
Answer should be 'B'

(3 + 2) ^ 3 = 5^3

therefore n = 3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 594
Joined: Thu Aug 14, 2008 11:51 pm
Thanked: 12 times

by nervesofsteel » Sat Jun 06, 2009 10:53 pm
Yes I also got B

But the OA mentioned is C

I hope its wrong....
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 385
Joined: Sun May 24, 2009 3:55 pm
Thanked: 11 times
GMAT Score:740

by Domnu » Sun Jun 07, 2009 11:07 am
Well, are you sure it's not something like POSITIVE integers?
Have you wondered how you could have found such a treasure? -T
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 179
Joined: Mon Dec 29, 2008 4:41 am
Thanked: 2 times

by abhinav85 » Mon Jun 08, 2009 1:03 pm
i think IMO is D.

from statment 1 we get,

n(n+2) = 15
n^2 + 2n - 15 =0
(n-3) (n+5)

So when we put n = 3 we get
15=15 suff.

from statment 2 we get,

(n+2)^N = 125

(n+2)^N= 5^3

so if we take n = 3

we get 5^3=5^3.

Hence D.

Please tell if i am missing something.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 385
Joined: Sun May 24, 2009 3:55 pm
Thanked: 11 times
GMAT Score:740

by Domnu » Mon Jun 08, 2009 1:39 pm
abhinav85 wrote:i think IMO is D.

from statment 1 we get,

n(n+2) = 15
n^2 + 2n - 15 =0
(n-3) (n+5)

So when we put n = 3 we get
15=15 suff.

from statment 2 we get,

(n+2)^N = 125

(n+2)^N= 5^3

so if we take n = 3

we get 5^3=5^3.

Hence D.

Please tell if i am missing something.
Hello, abhinav. You're missing a slight detail in the first part; n = 3, -5, and not only 3.
Have you wondered how you could have found such a treasure? -T
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1