Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

1000 DS section 5- Q-23

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 31
Joined: Sun Jan 07, 2007 11:13 pm
by ash_maverick » Thu Jun 11, 2009 9:14 am
If ☉ denotes a mathematical operation, does
x☉y=y☉x for all x and y?
(1) For all x and y, x☉y = 2(x2 + y2).
(2) For all y, 0☉y = 2 y2

Can somebody please provide me the step wise solution?
Top
Join the discussion
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 179
Joined: Mon Dec 29, 2008 4:41 am
Thanked: 2 times

by abhinav85 » Thu Jun 11, 2009 10:55 am
IMO D

the sign between x and y denotes addition.
Top
Join the discussion
Legendary Member
Posts: 752
Joined: Sun May 17, 2009 11:04 pm
Location: Tokyo
Thanked: 81 times
GMAT Score:680

by tohellandback » Thu Jun 11, 2009 6:52 pm
IMO A
1)x☉y = 2(x2 + y2).
so, y☉x = 2( y2+x2 ).
both are same ..SUFF

2) nothing is being said about x-INSUFF
The powers of two are bloody impolite!!
Top
Join the discussion
Newbie | Next Rank: 10 Posts
Posts: 6
Joined: Wed Feb 14, 2007 1:34 am
Location: India, bangalore

by bizwizashish » Sat Jun 13, 2009 8:59 am
does the original question says mathmetical operation or function....

If operation.. i don't think we can find anything.. but if it's function then answer is D
Regards,
Ashish Khandelwal
Top
Join the discussion
Legendary Member
Posts: 575
Joined: Tue Nov 04, 2008 2:58 amFollowed by: 4 members
Location: India
Thanked: 18 times
GMAT Score:710

by rahulg83 » Sun Jun 14, 2009 2:11 am
IMO A
Top
Join the discussion
User avatar
Legendary Member
Posts: 682
Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member
Thanked: 32 times

by Vemuri » Sun Jun 14, 2009 2:49 am
IMO A. I agree with tohellandback's explanation
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 121
Joined: Thu Jun 11, 2009 1:16 am
Thanked: 4 times
GMAT Score:720

by Naruto » Sun Jun 14, 2009 5:37 am
IMO A , Ditto as To hellandback. Whats the OA. Hey guys i wanted to know if 1000 series are any useful?
Top
Join the discussion
Legendary Member
Posts: 752
Joined: Sun May 17, 2009 11:04 pm
Location: Tokyo
Thanked: 81 times
GMAT Score:680

by tohellandback » Sun Jun 14, 2009 5:41 am
Naruto wrote:IMO A , Ditto as To hellandback. Whats the OA. Hey guys i wanted to know if 1000 series are any useful?
I have been told that the 1000 series has got a errors in the answers
The powers of two are bloody impolite!!
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 19
Joined: Wed Feb 20, 2008 10:41 am

Re: 1000 DS section 5- Q-23

by mna123 » Sun Jun 14, 2009 7:44 am
ash_maverick 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(x2 + y2).
(2) For all y, 0☉y = 2 y2

Can somebody please provide me the step wise solution?

Can you please send me 1000 DS at namon20ATyahoodotcom
Top
Join the discussion