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 →

DS- OG11 # 146

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 9
Joined: Sun Sep 30, 2007 2:36 pm
Location: Mississauga
by willywonka14 » Sun Jan 06, 2008 4:28 pm
Hi,
I hope someone could help me out with this question....Im having a hard time understanding the correct answer...

here it is:


Is n an integer?

I. n squared is an integer.

II. Square root of n is an integer.


thanks
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 158
Joined: Mon Dec 03, 2007 8:32 am
Thanked: 7 times

by StarDust845 » Sun Jan 06, 2008 4:48 pm
Is n an integer?

I. n squared is an integer.
II. Square root of n is an integer.

From (I) 3 squared is an integer --> n is an integer however, sqrt(2) squared is also an integer but sqrt(2) is not. Hence answer is B,C or E.

From (II) implies sqrt(n) = m where m is an integer. Squaring both sides we get n = m*m where m is an integer and hence n MUST be integer.

Hence answer is B.

Calista.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 94
Joined: Tue Oct 14, 2008 1:05 pm

og ds 146

by simba12123 » Tue Oct 28, 2008 5:25 pm
OK so I am really leaning towards qa is D. However, I dont see the logic as to why the statement 1 is insifficient.

I am plugging in answers 1,2,3,4,etc. Fractions will not work here therefore qa is imo D, which is wrong but why?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 80
Joined: Thu Jan 31, 2008 9:15 pm
Thanked: 2 times

by linfongyu » Tue Oct 28, 2008 8:56 pm
simba12123, for statement1, let n = sqrt(n), n=2, 3, 5, 6, 7... non-perfect squared numbers.

n=sqrt(2), not an integer. n^2 is an integer.
n=sqrt(4), an integer. n^2 is an integer.

therefore, statement 1 is NS.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 2134
Joined: Mon Oct 20, 2008 11:26 pmFollowed by: 25 members
Thanked: 237 times
GMAT Score:730

Re: og ds 146

by logitech » Tue Oct 28, 2008 9:56 pm
simba12123 wrote:OK so I am really leaning towards qa is D. However, I dont see the logic as to why the statement 1 is insifficient.

I am plugging in answers 1,2,3,4,etc. Fractions will not work here therefore qa is imo D, which is wrong but why?
Simba this is what first statement tells you:

N^2 = k OR N = Square Root ( k ) , where k is integer

so you should give values to k and check for N

for k=1 N=1 - you are good
for k=2 N=1.4 - STOP!

INSUF
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1