DS doubt2

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anujgoyal11: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Mon Jul 02, 2007 1:49 am; Location: Mumbai

by anujgoyal11 » Sat Jul 07, 2007 10:34 am

Does x + y = 0?
(1) xy<0
(2) x2 = y2
Ans Given is : C but I think B as 2 statement is alone sufficient..

Please give me ur comments

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Source: Beat The GMAT — Data Sufficiency | Sat Jul 07, 2007 10:34 am

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member; Location: Silicon valley, California; Thanked: 30 times

by jayhawk2001 » Sat Jul 07, 2007 11:49 am

(2) tells you that x = +y or x = -y. You cannot conclude x+y=0 from
this alone.

(1) tells you that either x or y (but not both) is negative.

Hence C

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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Sun Jul 08, 2007 5:33 am

Stat(1) says that either x or y must be negative.The ans can be yes or no if u pick numbers.

Stat(2) says that x^2=y^2 ...Here u should always remember that x^2 can be +x or -x.therefore u cannot conclude anything from this.

So the answer is C

Maxx

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