BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Symbols

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 489
Joined: Tue Jul 05, 2011 11:10 am
Thanked: 28 times
Followed by:5 members

Symbols

by gmatblood » Mon Oct 31, 2011 12:42 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(x^2+y^2).
(2) For all y, 0☉y = 2(y^2)
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 2789
Joined: Tue Jul 26, 2011 12:19 am
Location: Chennai, India
Thanked: 206 times
Followed by:43 members
GMAT Score:640

by GmatKiss » Mon Oct 31, 2011 12:43 am
IMO: A

2) Is cleary not sufficient!
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 416
Joined: Tue Aug 30, 2011 2:18 pm
Location: Delhi, India
Thanked: 13 times
Followed by:9 members

by vaibhavgupta » Mon Oct 31, 2011 5:33 am
gmatblood 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)
+1 for A
Top
Post new topic Post Reply
• Page 1 of 1