GMATprep DS Sqaure : GMAT Data Sufficiency (DS)

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GMATprep DS Sqaure [#permalink]

10 Nov 2007, 02:17

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I simplified question stem and arrived to:

Is X = 3?

1. I can't see why X !=3 is not sufficient
2. I can't understand (2)...

thanks ,Guy

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[#permalink]

10 Nov 2007, 05:37

For any x ---> sqrt(x^2) = |x|

so you are being asked:

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

statement 1

insufficient

statement 2

this will tells you that x is negative since |x| is positive and -(-n) is positive.

sufficient

the answer is (B)

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Re: GMATprep DS Sqaure [#permalink]

10 Nov 2007, 23:59

GGUY wrote:

I simplified question stem and arrived to:

Is X = 3?

1. I can't see why X !=3 is not sufficient
2. I can't understand (2)...

thanks ,Guy

From 1, x could be > or < 3.
from 2, x is only -ve. so it is suficient to answer than the equation holds true.

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KillerSquirrel isn't the formula true for every x<=3 ? [#permalink]

11 Nov 2007, 09:34

Quote:

so you are being asked:

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

KillerSquirrel, from my calculations i gather that the formula is true for every x<=3.

(try x=3, x=2,x=1, x=0), it still means you are correct of course.
the OA is B.

please tell me how did you arrive to those values, perhaps it's my bad.

i'll be happy to know in general how you solve absolute values questions.

thanks Guy :oops:

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Re: KillerSquirrel isn't the formula true for every x<=3 [#permalink]

11 Nov 2007, 12:02

GGUY wrote:

Quote:

so you are being asked:

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

Of course you are right ---> x <= 3

But this dosen't change the answer since x<0 is still in the range and x <> 3 can be anything (i.e 4 ---> out of range).

About solving absolute values questions ---> see attachment

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Re: KillerSquirrel isn't the formula true for every x<=3 [#permalink] 11 Nov 2007, 12:02

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