Find all School-related info fast with the new School-Specific MBA Forum

It is currently 27 Nov 2014, 23:03

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Is N an integer ? (1) N^2 is an integer. (2) SQRT(N) is an

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 03 Jul 2003
Posts: 656
Followers: 2

Kudos [?]: 18 [0], given: 0

Is N an integer ? (1) N^2 is an integer. (2) SQRT(N) is an [#permalink] New post 12 Dec 2003, 17:38
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:34) correct 0% (00:00) wrong based on 1 sessions
Is N an integer ?
(1) N^2 is an integer.
(2) SQRT(N) is an integer.


Can any one give me an number whose square is an integer?
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2003
Posts: 252
Location: USA
Followers: 1

Kudos [?]: 5 [0], given: 0

 [#permalink] New post 12 Dec 2003, 19:25
vote for B as well.

Can any one give me an number whose square is an integer?

SQRT(3)
Director
Director
User avatar
Joined: 13 Nov 2003
Posts: 971
Location: Florida
Followers: 1

Kudos [?]: 24 [0], given: 0

 [#permalink] New post 12 Dec 2003, 19:44
why is it not D. i feel like a cretin :(
Manager
Manager
avatar
Joined: 06 Jun 2003
Posts: 59
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink] New post 12 Dec 2003, 19:58
2 is an integer, but sqrt(2) is not ...

I had the same idea as well, but I am trying to train myself to plug in atleast these numbers for any DS question : -2, -1, 0, 1, 2 and sqrt(2) ..
Director
Director
User avatar
Joined: 13 Nov 2003
Posts: 971
Location: Florida
Followers: 1

Kudos [?]: 24 [0], given: 0

 [#permalink] New post 12 Dec 2003, 20:21
bluefox420 wrote:
2 is an integer, but sqrt(2) is not ...

I had the same idea as well, but I am trying to train myself to plug in atleast these numbers for any DS question : -2, -1, 0, 1, 2 and sqrt(2) ..


gosh..! it 's gotta be the friday.

thanks, bluefox.
SVP
SVP
User avatar
Joined: 30 Oct 2003
Posts: 1798
Location: NewJersey USA
Followers: 4

Kudos [?]: 40 [0], given: 0

 [#permalink] New post 12 Dec 2003, 20:35
I tried to explain that A also is sufficient. ( pitts20042006 corrected me - so I am modifying my post )
Answer - B is sufficent.
Choice A - if square N is integer then sqrt of N may or may not be integer.
Choice B - if sqrt of N is integer then N has to be integer. If we consider 2 or 3 as integers(n=2 or N=3) then their sqrt is not an integer. That does not mean that the sqrt(N) if it is integer then N is not integer. B would have been wrong if the question were is sqrt(N) integer ? given N as integer.
For example sqrt(4) = 2 which an integer meaning N=4 which is definitely integer.

Last edited by anandnk on 12 Dec 2003, 20:47, edited 1 time in total.
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2003
Posts: 252
Location: USA
Followers: 1

Kudos [?]: 5 [0], given: 0

 [#permalink] New post 12 Dec 2003, 20:40
Dear anand,

A is NOT sufficient.

A says N^2 is an integer.

take, N^2 = 5 --> which is definitely an integer :)

take SQRT of both side

thus we have N = SQRT(5)

Now is N an integer here?? NO
So A is not sufficient.
CEO
CEO
avatar
Joined: 15 Aug 2003
Posts: 3470
Followers: 61

Kudos [?]: 680 [0], given: 781

Re: G+ DS-20-19 [#permalink] New post 12 Dec 2003, 22:59
kpadma wrote:
Is N an integer ?
(1) N^2 is an integer.
(2) SQRT(N) is an integer.


Can any one give me an number whose square is an integer?

any integer if squared will give you an integer.

(1) clearly insufficient
(2) sufficient.. its can only be a perfect square.

B
Director
Director
avatar
Joined: 03 Jul 2003
Posts: 656
Followers: 2

Kudos [?]: 18 [0], given: 0

 [#permalink] New post 13 Dec 2003, 06:29
Thanks Guys.

After posting the question, I relaised what was the mistake I made.

The official answer is B.
  [#permalink] 13 Dec 2003, 06:29
    Similar topics Author Replies Last post
Similar
Topics:
is n an integer? 1) n ^ 2 is an integer chronolinkz 4 10 Aug 2007, 12:06
Is 'n' an integer? (1) n^2 is an integer. (2) sqrt(n) is an ben928 3 24 Jul 2007, 13:56
Is n an integer? n^2 is an integer sqrt(n) is an integer ggarr 5 26 Feb 2007, 00:11
Is n an integer? 1) n^2 is an integer 2)SQRT(n) is an buckkitty 8 31 May 2006, 18:32
Is n an integer? 1) n^2 is an integer 2) sqrt(n) is an omomo 5 18 Nov 2005, 18:00
Display posts from previous: Sort by

Is N an integer ? (1) N^2 is an integer. (2) SQRT(N) is an

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.