number system

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piyush272: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Fri Jan 20, 2012 10:18 am

by piyush272 » Wed Feb 08, 2012 5:07 am

data sufficiency!??

is x=y?
1)x^2=y^2
2)|x|^2 + |y|^2 = 2|xy|

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Source: Beat The GMAT — Problem Solving | Wed Feb 08, 2012 5:07 am

Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 amFollowed by: 266 members; Location: New York; Thanked: 660 times; GMAT Score:770

by Jim@StratusPrep » Wed Feb 08, 2012 6:34 am

The best thing to do with absolute value questions is test positive and negative numbers.

1) they could be positive or negative. INSUFFICIENT

2) again could be positive or negative. 3 and 3 works, so does 3 and -3. INSUFFICIENT

answer is E as both are essentially giving you the same info.

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pemdas: Legendary Member; Posts: 1084; Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members; Thanked: 158 times

by pemdas » Wed Feb 08, 2012 6:37 am

this thread needs to be placed in DS section
my sol. follows

st(1) implies |x|=|y| Insuff
st(2) implies (|x|-|y|)^2=0 OR |x|-|y|=0 which is the same as |x|=|y| Insuff

Combining both still Insuff, as both statements imply the same condition

e

piyush272 wrote:data sufficiency!??

is x=y?
1)x^2=y^2
2)|x|^2 + |y|^2 = 2|xy|

Success doesn't come overnight!

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