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# PS_Greater than Zero

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Manager
Joined: 01 Aug 2008
Posts: 103

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14 Jun 2009, 09:10
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Explain pls

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Do not answer without sharing the reasoning behind ur choice
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Working on my weakness : GMAT Verbal
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Manager
Joined: 30 May 2009
Posts: 202

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14 Jun 2009, 09:20
I think the answer should be B

sqrt(z) will be greater than z only in one situation, 0 < Z < 1

(1) Z > 0 => Z could be any number
if Z = 4, sqrt(z) = 2 < z
if Z = 1/4 sqrt(z) = 1/2 > Z
Therefore, INSUFF

(2) sqrt(z) < 1
And the question already states that (sqrt)z > 0
So we are given that 0 < sqrt(z) < 1
Which is possible only if Sqrt(z) > z
SUFF.

What is the OA??
Manager
Joined: 08 Feb 2009
Posts: 139
Schools: Anderson

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14 Jun 2009, 10:33
sdrandom1 wrote:
I think the answer should be B

sqrt(z) will be greater than z only in one situation, 0 0 => Z could be any number
if Z = 4, sqrt(z) = 2 Z
Therefore, INSUFF

(2) sqrt(z) 0
So we are given that 0 z
SUFF.

What is the OA??

Its true.

$$\sqrt{Z} \hspace{5} > \hspace{5} Z \hspace{10} \Leftrightarrow \hspace{10} 0 \hspace{5}< \hspace{5} Z \hspace{5}< \hspace{5} 1 \small \hspace{5}or \hspace{5} \large Z\hspace{5} is \hspace{5}a \hspace{5} +^{ve} \hspace{5} FRACTION$$

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: PS_Greater than Zero &nbs [#permalink] 14 Jun 2009, 10:33
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