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

It is currently 21 Oct 2014, 23:08

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

If denotes a mathematical operation, does x y=y x for all x

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 16 Jul 2009
Posts: 266
Followers: 2

Kudos [?]: 43 [0], given: 3

If denotes a mathematical operation, does x y=y x for all x [#permalink] New post 01 Apr 2010, 11:33
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
If ☉ denotes a mathematical operation, does x☉y=y☉x for all x and y?
(1) For all x and y, x☉y = 2(x^2 + y^2).
(2) For all y, 0☉y = 2 y^2
Manager
Manager
avatar
Joined: 26 May 2005
Posts: 210
Followers: 2

Kudos [?]: 71 [0], given: 1

Re: Mathematical Symbols [#permalink] New post 01 Apr 2010, 11:50
abhi758 wrote:
If ☉ denotes a mathematical operation, does x☉y=y☉x for all x and y?
(1) For all x and y, x☉y = 2(x^2 + y^2).
(2) For all y, 0☉y = 2 y^2


st 1) xOy = 2(x^2+y^2)
yOx=2(y^2+x^2)
Yes. Sufficient
st 2) 0Oy = 2 * y^2 -- this expression varies with y
yO0 = 2 * 0 = 0 .. this expression is always 0
but both expression will be 0 if y=0 and different if y!=0
not sufficient

A
Senior Manager
Senior Manager
User avatar
Joined: 19 Nov 2009
Posts: 329
Followers: 4

Kudos [?]: 61 [0], given: 44

Re: Mathematical Symbols [#permalink] New post 02 Apr 2010, 14:17
Even I'll go with A !

What's the OA ?
_________________

"Success is going from failure to failure without a loss of enthusiam." - Winston Churchill

As vs Like - Check this link : http://www.grammar-quizzes.com/like-as.html.

Manager
Manager
User avatar
Joined: 26 Feb 2010
Posts: 79
Location: Argentina
Followers: 4

Kudos [?]: 7 [0], given: 1

Reviews Badge
Re: Mathematical Symbols [#permalink] New post 08 Apr 2010, 12:09
A

With B we don't know what happen with the other numbers
Re: Mathematical Symbols   [#permalink] 08 Apr 2010, 12:09
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Let ∇ denote a mathematical operation. Is it true that x ∇ y conty911 3 25 Apr 2012, 21:35
If denotes a mathematical operation, does x y = y x for all tracyyahoo 3 31 Jul 2011, 03:14
If denotes a mathematical operation, does x y=y x for all x el1981 2 03 May 2008, 12:02
If * denotes a mathematical operation, does x*y=Y*x for all nfa1rhp 7 29 Jul 2007, 10:58
If # denotes a mathematical operation, does x#y=y#x for all kripalkavi 1 14 Nov 2006, 17:14
Display posts from previous: Sort by

If denotes a mathematical operation, does x y=y x for all x

  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®.