ds test 5 # 23

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

ds test 5 # 23

by dunkin77 » Fri Apr 06, 2007 5:08 pm

Hi,

The answer is A) but I cant figure out why.... could anyone please explain? (I thought the answer was D) cause both a) and 2) look addition)

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

Quote

Source: Beat The GMAT — Data Sufficiency | Fri Apr 06, 2007 5:08 pm

Neo2000: Legendary Member; Posts: 519; Joined: Sat Jan 27, 2007 7:56 am; Location: India; Thanked: 31 times

by Neo2000 » Fri Apr 06, 2007 5:47 pm

Question can be answered from statement 1 alone. Statement 1 defines the function in terms of both Xand Y and you can prove tht X0Y = YoX whereas statement2 ONLY defines in terms of Y. What is part played by X? is it X2 or X3 or....