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x and y are positive integers, is X^y <= Y^x? 1. X = y^2

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Director
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Joined: 08 Jun 2004
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x and y are positive integers, is X^y <= Y^x? 1. X = y^2 [#permalink] New post 14 Aug 2006, 22:05
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
x and y are positive integers, is X^y <= Y^x?

1. X = y^2

2. X = 2y

Not sure about the OA, let's discuss guys.
CEO
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Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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 [#permalink] New post 14 Aug 2006, 22:54
I think this is A

St1:
x--------y-----------ANSWER
25------5-----------YES
1--------1----------YES
4--------2----------YES
SUFF

St2:
x--------y-----------ANSWER
8--------4----------YES
2--------1----------NO
1--------1-----------YES
INSUFF
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

GMAT Instructor
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 [#permalink] New post 15 Aug 2006, 00:06
x and y are positive integers, is X^y <= Y^x?

1. X = y^2

2. X = 2y

With (1) LS= y^(2y) RS= y^(y^2)

If y=1, LS=RS=1, and if y is at least 2, y^2-2y=y(y-2)>=0, so y^2>=2y and RS>=LS

Suff

With (2) LS= (2y)^y RS= y^(2y)=(y^2)^y

Here if y=1 LS=2>1=RS, but if y=2, LS=RS=16

Not suff
Manager
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 [#permalink] New post 15 Aug 2006, 11:09
I think this is A
Quote:
St1:
x--------y-----------ANSWER
25------5-----------YES
1--------1----------YES
4--------2----------YES
SUFF

St2:
x--------y-----------ANSWER
8--------4----------YES
2--------1----------NO
1--------1-----------YES
INSUFF
_________________



I concur... A it is
Manager
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Re: DS: X^y <= Y^x [#permalink] New post 17 Aug 2006, 20:17
M8 wrote:
x and y are positive integers, is X^y <= Y^x?

1. X = y^2

2. X = 2y

Not sure about the OA, let's discuss guys.


x,y={I,+}
(1) x=4 y=2 Yes
x=1, y=1 yes
x=9, y = 3 yes
x=100, y =10 yes

AD

(2) x=2 y =1 No
x=4 y=2 Yes

Hence A

Heman
Re: DS: X^y <= Y^x   [#permalink] 17 Aug 2006, 20:17
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x and y are positive integers, is X^y <= Y^x? 1. X = y^2

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