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[DS][Zero] HSPA posts

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by HSPA » Sun Apr 10, 2011 1:14 am
what is value of X?

1) x is even
2) x^2 = 4x

Old question but let see how many remember the truth about zero...
First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.
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Source: — Data Sufficiency |
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by vineeshp » Sun Apr 10, 2011 5:02 am
OA E?

1) x is even. Not sufficient.

2) x^2 = 4x
x (x-4) = 0
x=0 or x=4
NS.

Combined
1 and 2. No new info.

E
Vineesh,
Just telling you what I know and think. I am not the expert. :)
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by rohu27 » Mon Apr 11, 2011 4:09 am
I will go with E too.
HSPA,
you really shudnt have given tht hint abt 0 :D it would test me then :P
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by AIM GMAT » Mon Apr 11, 2011 4:16 am
HSPA wrote:what is value of X?

1) x is even
2) x^2 = 4x

Old question but let see how many remember the truth about zero...
ST 1 ] X = 2,4,6,.... => INSUFF

ST 2 ] x^2 = 4x

x^2 - 4x = 0
x (x - 4)= 0
x = 0 ; x = 4. => INSUFF

ST 1 + ST 2 => 0 and 4 both are even , so we cannot reach to a solution => INSUFF

IMO E
Thanks & Regards,
AIM GMAT
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by isanju » Mon Apr 11, 2011 5:42 am
This is a typical example of quadratic equation with multiple solution

Answer: E
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