It is currently 20 Mar 2018, 03:01

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x and y are positive, is x^3 > y ? (1) x^1/2 > y

Author Message
Manager
Joined: 04 Jan 2008
Posts: 117
If x and y are positive, is x^3 > y ? (1) x^1/2 > y [#permalink]

Show Tags

06 Sep 2008, 00:26
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x and y are positive, is x^3 > y ?

(1) x^1/2 > y
(2) x > y
SVP
Joined: 29 Aug 2007
Posts: 2457

Show Tags

06 Sep 2008, 00:50
dancinggeometry wrote:
If x and y are positive, is x^3 > y ?

(1) x^1/2 > y
(2) x > y

E. if x = 0.49 and y = 0.5, no.
if x = 1 and y = 0.5, yes.
_________________

Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Director
Joined: 23 Sep 2007
Posts: 768

Show Tags

06 Sep 2008, 00:50
dancinggeometry wrote:
If x and y are positive, is x^3 > y ?

(1) x^1/2 > y
(2) x > y

E

scenario 1: x = .49, y = .4, this would satisfy both statements, but x^3 < y

scenario 1: x = 49, y = 1, this would satisfy both statements, but x^3 > y
VP
Joined: 05 Jul 2008
Posts: 1377

Show Tags

06 Sep 2008, 12:07
E is my pick as well.

Both cases by themselves and together hold for integers. Does not hold for fractions.
Manager
Joined: 04 Jan 2008
Posts: 117

Show Tags

06 Sep 2008, 23:43
OA is E. Bin 2 problem.
Current Student
Joined: 11 May 2008
Posts: 552

Show Tags

07 Sep 2008, 10:44
i think its best to analyse using the no. line.
we know taht when a no. is a fraction , then its cube and square are smaller than the no. itself.

below x and y are such that x>y and there is infinitesimally small gap bet'n the two.

stat 1) x^1/2>y

stat 2) x>y.

_________0___x2_____y_x__x1_1___
on taking the root, x jumps to x1 say, so x1>y , but x^3 shifts x to x2 and here x^3<y.
Re: Zumit DS 010   [#permalink] 07 Sep 2008, 10:44
Display posts from previous: Sort by