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

It is currently 18 Sep 2014, 01:45

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

PS-Must Be True- 2

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Director
Director
User avatar
Joined: 04 Jan 2008
Posts: 919
Followers: 45

Kudos [?]: 167 [1] , given: 17

GMAT Tests User
PS-Must Be True- 2 [#permalink] New post 01 Apr 2009, 01:13
1
This post received
KUDOS
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (02:22) correct 0% (00:00) wrong based on 0 sessions
If a and b are both even non-zero integers, which of the following must be true?

A) The product of a and b is odd

B) The sum of a and b is odd

C) a - b > 0

D) a raised to the b power is even

E) (a + b)/4 is even

_________________

math-polygons-87336.html
competition-for-the-best-gmat-error-log-template-86232.html

Current Student
avatar
Joined: 13 Jan 2009
Posts: 374
Location: India
Followers: 18

Kudos [?]: 59 [0], given: 1

GMAT Tests User
Re: PS-Must Be True- 2 [#permalink] New post 01 Apr 2009, 15:45
Bad question.

If you give a and b are positive integers then D will be true else all choices are wrong.

I can prove C D and E true if question changes to could be true instead of must be true.
Director
Director
User avatar
Joined: 04 Jan 2008
Posts: 919
Followers: 45

Kudos [?]: 167 [0], given: 17

GMAT Tests User
Re: PS-Must Be True- 2 [#permalink] New post 02 Apr 2009, 02:20
OE says

It's easiest to find examples that prove the other four choices wrong. For answers A, B, and C, choosing a=2 and b=4 makes the statements incorrect. For answer E, choosing a=4 and b=8 makes the statement false. Answer D is the only one that holds true always.


thx
_________________

math-polygons-87336.html
competition-for-the-best-gmat-error-log-template-86232.html

GMAT Instructor
avatar
Joined: 24 Jun 2008
Posts: 967
Location: Toronto
Followers: 256

Kudos [?]: 681 [0], given: 3

GMAT Tests User
Re: PS-Must Be True- 2 [#permalink] New post 02 Apr 2009, 06:11
nitya34 wrote:
OE says

It's easiest to find examples that prove the other four choices wrong. For answers A, B, and C, choosing a=2 and b=4 makes the statements incorrect. For answer E, choosing a=4 and b=8 makes the statement false. Answer D is the only one that holds true always.


thx


Either the OE is wrong, or there's a word missing from the question. What's the source? D certainly must be true *if* a and b are *positive* even integers. The question (as posted) only says that they are 'non-zero', which means they could be negative. If a = 2, and b = -2, then a^b = 1/4, and is not an integer, so certainly is not even.
_________________

Nov 2011: After years of development, I am now making my advanced Quant books and high-level problem sets available for sale. Contact me at ianstewartgmat at gmail.com for details.

Private GMAT Tutor based in Toronto

Intern
Intern
avatar
Joined: 29 Dec 2006
Posts: 32
Followers: 0

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

Re: PS-Must Be True- 2 [#permalink] New post 15 Apr 2009, 15:36
it's funny how i automatically assumed the numbers are positive. is that word supposed to be in the question? also, just for my fyi, what does oe stand for?
Manager
Manager
User avatar
Joined: 14 Nov 2008
Posts: 200
Schools: Stanford...Wait, I will come!!!
Followers: 3

Kudos [?]: 31 [0], given: 3

GMAT Tests User
Re: PS-Must Be True- 2 [#permalink] New post 16 Apr 2009, 04:27
OE = Offical Explanation
OA = Official Answer
gmat911 wrote:
it's funny how i automatically assumed the numbers are positive. is that word supposed to be in the question? also, just for my fyi, what does oe stand for?
Senior Manager
Senior Manager
User avatar
Joined: 19 Aug 2006
Posts: 256
Followers: 2

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

GMAT Tests User
Re: PS-Must Be True- 2 [#permalink] New post 16 Apr 2009, 08:59
I also think it's a bad question.
Either the word "positive" in the question stem, or another answer choice 'none' is missing.
Re: PS-Must Be True- 2   [#permalink] 16 Apr 2009, 08:59
    Similar topics Author Replies Last post
Similar
Topics:
18 Experts publish their posts in the topic If y=−m^2, which of the following must be true? Joy111 15 01 Jun 2012, 00:55
1 PS-Must Be True- 2 nitya34 6 01 Apr 2009, 01:13
PS-Must Be True nitya34 8 01 Apr 2009, 01:11
Is it true? tel93 1 03 Jan 2005, 05:49
Display posts from previous: Sort by

PS-Must Be True- 2

  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®.