Absolute value--> DS question

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haisuresh: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Thu Apr 29, 2010 2:17 am

by haisuresh » Fri Sep 17, 2010 8:54 am

Its a DS question

is |x| > |y| ?

1. x^2 > y^2
2. x > y

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Source: Beat The GMAT — Problem Solving | Fri Sep 17, 2010 8:54 am

beatthegmatinsept: Master | Next Rank: 500 Posts; Posts: 422; Joined: Mon Aug 09, 2010 11:47 amFollowed by: 1 member; Thanked: 22 times; GMAT Score:680

by beatthegmatinsept » Fri Sep 17, 2010 9:01 am

haisuresh wrote:Its a DS question

is |x| > |y| ?

1. x^2 > y^2
2. x > y

IMO A.

Being defeated is often only a temporary condition. Giving up is what makes it permanent.

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haisuresh: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Thu Apr 29, 2010 2:17 am

by haisuresh » Fri Sep 17, 2010 9:23 am

How ?

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beatthegmatinsept: Master | Next Rank: 500 Posts; Posts: 422; Joined: Mon Aug 09, 2010 11:47 amFollowed by: 1 member; Thanked: 22 times; GMAT Score:680

by beatthegmatinsept » Fri Sep 17, 2010 9:29 am

haisuresh wrote:Its a DS question

is |x| > |y| ?

1. x^2 > y^2
2. x > y

(a) Since absolute value of any number is always positive, so is the square of any number. So if the square of x is greater than square of y, then |x| must be > |y|.
(For a quick check, you can take a couple different values of x and y and look for same results).
Sufficient.

(b) x > y
Should be fine when both x and y are positive.
But if y is negative,
e.g. x = 3, y = -4, then x > y.
BUT we are talking absolute values here,
so |3| is NOT > |-4|.
Insufficient.

Whats the OA?

Being defeated is often only a temporary condition. Giving up is what makes it permanent.

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haisuresh: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Thu Apr 29, 2010 2:17 am

by haisuresh » Fri Sep 17, 2010 9:36 am

OA : A

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