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

It is currently 24 Oct 2014, 19:06

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

M03 #24 DS Question

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
3 KUDOS received
Manager
Manager
avatar
Joined: 07 Jan 2008
Posts: 87
Followers: 2

Kudos [?]: 34 [3] , given: 1

M03 #24 DS Question [#permalink] New post 09 Dec 2008, 15:09
3
This post received
KUDOS
5
This post was
BOOKMARKED
Is N^x even?

1. N is even
2. x^2-3x+2 = 0

[Reveal] Spoiler: OA
C

Source: GMAT Club Tests - hardest GMAT questions

REVISED VERSION OF THIS QUESTION IS HERE: m03-24-ds-question-73770.html#p1249364
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
Manager
Manager
avatar
Joined: 07 Jan 2008
Posts: 87
Followers: 2

Kudos [?]: 34 [0], given: 1

Re: M03 DS Question [#permalink] New post 09 Dec 2008, 15:13
I think the answer is A.

But the OA is C.

An even number raised to any power is always even.

(2) provides the power as 1 or 2. But doesn't give anything about the base.
2 KUDOS received
Intern
Intern
avatar
Joined: 05 Oct 2008
Posts: 14
Followers: 0

Kudos [?]: 11 [2] , given: 0

Re: M03 DS Question [#permalink] New post 09 Dec 2008, 16:15
2
This post received
KUDOS
Quote:
An even number raised to any power is always even.


The power needs to be a positive integer for this statement to be true.

You need the second equation to find that x is a positive integer.
4 KUDOS received
CEO
CEO
User avatar
Joined: 29 Aug 2007
Posts: 2500
Followers: 54

Kudos [?]: 512 [4] , given: 19

Re: M03 DS Question [#permalink] New post 09 Dec 2008, 22:04
4
This post received
KUDOS
topmbaseeker wrote:
Is N^x even?

1. N is even
2. x^2-3x+2 = 0

(C) 2008 GMAT Club - m03#24

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient



has to be C.

1: n = lets say 2 but x could be -1, 0, 0.5, 2. Then in all cases, n^x is not an even. so nsff..
2: x = 1 or 2 but what is n? nsf.

therefore, C.
_________________

Verbal: new-to-the-verbal-forum-please-read-this-first-77546.html
Math: new-to-the-math-forum-please-read-this-first-77764.html
Gmat: everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Intern
Intern
avatar
Joined: 10 Jun 2010
Posts: 46
Followers: 0

Kudos [?]: 10 [0], given: 2

Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 04:24
Good question. Even i picked A on the first go. However, after seeing the answer, C made sense :)
1 KUDOS received
Intern
Intern
avatar
Joined: 27 May 2010
Posts: 6
Followers: 0

Kudos [?]: 22 [1] , given: 0

Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 09:34
1
This post received
KUDOS
Hi,
C is the correct option because even if N is even N^x can be odd.
Consider for example N = 4
N^0 = 4^0 =1 which is odd
If we consider the second statement then we come to know that x can be either 1 or 2.
So from 1 and 2 both we can answer the question properly hence the solution for this is C.
Intern
Intern
avatar
Joined: 10 Jul 2010
Posts: 5
Followers: 0

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

Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 11:33
i made the same mistake...i chose A....well that was tricky one...
Intern
Intern
avatar
Joined: 29 Mar 2010
Posts: 16
Schools: UCLA, USC
WE 1: 3 Yr at leading SAAS company
Followers: 0

Kudos [?]: 4 [0], given: 0

Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 14:35
Easy one..!!

C.
Both Stmt together solve the purpose.

Since to be even depends upon both N & x .we need to have both to conclude.
Intern
Intern
avatar
Joined: 07 Jul 2010
Posts: 13
Followers: 0

Kudos [?]: 7 [0], given: 3

GMAT ToolKit User
Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 17:59
How did you get x=1 or X=2 from x2 -3X+2 = 0.
Just from trying figures starting from 0 or can the equation be written in a way that makes it solution obvious ?
Intern
Intern
avatar
Joined: 29 Mar 2010
Posts: 16
Schools: UCLA, USC
WE 1: 3 Yr at leading SAAS company
Followers: 0

Kudos [?]: 4 [0], given: 0

Re: M03 #24 DS Question [#permalink] New post 15 Jul 2010, 18:13
x2-3x+2=0

x2-x-2x+2=0

x(x-1) -2(x-1)=0
(x-2)(x-1)=0

=>x=1 or x=2
Intern
Intern
avatar
Joined: 27 May 2010
Posts: 6
Followers: 0

Kudos [?]: 22 [0], given: 0

Re: M03 #24 DS Question [#permalink] New post 16 Jul 2010, 05:48
Francois wrote:
How did you get x=1 or X=2 from x2 -3X+2 = 0.
Just from trying figures starting from 0 or can the equation be written in a way that makes it solution obvious ?


Hi,
You need to know the basics of quadratic equation to solve.
Try searching for Crammers Rule.
Intern
Intern
User avatar
Joined: 17 May 2011
Posts: 15
Followers: 0

Kudos [?]: 1 [0], given: 6

GMAT ToolKit User
Re: M03 #24 DS Question [#permalink] New post 19 Jul 2011, 04:46
I chose (A) at first as well. We don't know whether X is an integer or not, that made sense for me. So the correct answer is (C) as far as we learn that N is a positive integer.
Manager
Manager
avatar
Joined: 14 Jun 2012
Posts: 66
Followers: 0

Kudos [?]: 9 [0], given: 1

Re: M03 #24 DS Question [#permalink] New post 23 Jul 2012, 13:15
Nice trick question . Easy but missed it. Accounted for the negative numbers as well but missed the fact that for a simple (2^-1) it fails. :(

Good one.
_________________

My attempt to capture my B-School Journey in a Blog : tranquilnomadgmat.blogspot.com

There are no shortcuts to any place worth going.

Intern
Intern
avatar
Joined: 16 Nov 2010
Posts: 10
Followers: 0

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

Re: M03 #24 DS Question [#permalink] New post 23 Jul 2013, 04:58
The answer is the first option. An even number raised to any number is always even.
However, for the quadratic equation, x=1,2. And it cannot be certainly be told if N^x is even without knowing the value of N.
Manager
Manager
avatar
Joined: 18 Oct 2011
Posts: 92
Location: United States
Concentration: Entrepreneurship, Marketing
GMAT Date: 01-30-2013
GPA: 3.3
Followers: 2

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

Re: M03 #24 DS Question [#permalink] New post 23 Jul 2013, 05:26
Statement 1: Insufficient. x could be 1 or x could be 0.
Statement 2: Insufficient. After factoring x = 2 or x = 1. We also do not know anything about N.

Combined 1 + 2. We know that N is even. An even number raised to either 1 or 2 would still be EVEN.
Sufficient. C.
Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23409
Followers: 3613

Kudos [?]: 28926 [1] , given: 2871

Re: M03 #24 DS Question [#permalink] New post 23 Jul 2013, 05:51
1
This post received
KUDOS
Expert's post
topmbaseeker wrote:
Is N^x even?

1. N is even
2. x^2-3x+2 = 0

[Reveal] Spoiler: OA
C

Source: GMAT Club Tests - hardest GMAT questions


BELOW IS REVISED VERSION OF THIS QUESTION:

If n is a positive integer, is n^x an even number?

(1) n is an even number
(2) x^2-3x+2 = 0

(1) n is an even number --> if x=0 then n^x=1=odd but if x=1 then n^x=n=even. Not sufficient.

(2) x^2-3x+2 = 0 --> x=1 or x=2. Not sufficient, since no info about n.

(1)+(2) Since given that n=even then both n^1 andn^2 will be even. Sufficient.

Answer: C.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

2 KUDOS received
BSchool Forum Moderator
User avatar
Joined: 14 Jul 2013
Posts: 269
Location: India
Concentration: Marketing, Strategy
GMAT 1: 690 Q49 V34
GMAT 2: 670 Q49 V33
GPA: 3.6
WE: Brand Management (Retail)
Followers: 8

Kudos [?]: 104 [2] , given: 116

GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: M03 #24 DS Question [#permalink] New post 08 Jul 2014, 04:29
2
This post received
KUDOS
This question reminds us the importance of fraction, negatives and zero. I lost out on my previous GMAT cuz of this, so now before freezing on the answer for variables in question always remember frazen(fractions, zero and negatives)

Posted from my mobile device Image
_________________

Cheers
Farhan

My Blog - Gladly Making an attempt today

INSEAD SEPT 2015 Intake Thread

2015 PROFILES W/ ADMIT/DINGS RESULTS!!

Intern
Intern
avatar
Joined: 13 Jun 2014
Posts: 1
Followers: 0

Kudos [?]: 0 [0], given: 3

Re: M03 #24 DS Question [#permalink] New post 08 Jul 2014, 06:48
Never forget about negatives!
Intern
Intern
User avatar
Joined: 02 Jul 2014
Posts: 11
Followers: 0

Kudos [?]: 3 [0], given: 32

GMAT ToolKit User
M03 #24 DS Question [#permalink] New post 08 Jul 2014, 07:17
Bunuel wrote:
BELOW IS REVISED VERSION OF THIS QUESTION:

If n is a positive integer, is n^x an even number?

(1) n is an even number
(2) x^2-3x+2 = 0


If n is not a positive integer.
I think the answer is E.
Cuz n could be 0, and 0^p always equals to 1.
Intern
Intern
avatar
Joined: 26 May 2013
Posts: 2
Concentration: Organizational Behavior, Strategy
GMAT Date: 12-10-2013
Followers: 0

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

Re: M03 #24 DS Question [#permalink] New post 08 Jul 2014, 09:28
N^x will must be even if a) N is even & b) x is non negative & non zero

i) Says N is even but doesn't say abt x
ii) Gives x as 1 or , but doesn't say abt N
combining both we get N even & x 1 or 2
so N^x must be even..
Hence 'C'
Re: M03 #24 DS Question   [#permalink] 08 Jul 2014, 09:28
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic M03-24 Bunuel 1 15 Sep 2014, 23:20
Experts publish their posts in the topic m03 # 11 question utlnghrn34 3 29 Jun 2011, 05:52
GClub M03, Question 7/37 - 3 overlapping sets BarneyStinson 2 02 Mar 2010, 18:45
15 Experts publish their posts in the topic M03 #24 DS Question topmbaseeker 21 09 Dec 2008, 15:09
16 Experts publish their posts in the topic gmatclub test question M03, Q32 : car dealership sanjay_gmat 12 19 Mar 2009, 09:53
Display posts from previous: Sort by

M03 #24 DS Question

  Question banks Downloads My Bookmarks Reviews Important topics  

Go to page    1   2    Next  [ 22 posts ] 

Moderators: WoundedTiger, Bunuel



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®.