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x, y are non zero integers: Is x^y < y^x

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x, y are non zero integers: Is x^y < y^x [#permalink] New post 02 Nov 2012, 12:50
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x, y are non zero integers: Is x^y < y^x

(1) x<y
(2) x and y are consecutive integers

What's the fastest method to solve this problem?
[Reveal] Spoiler: OA

Last edited by Bunuel on 02 Nov 2012, 13:22, edited 1 time in total.
Renamed the topic and edited the question.
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Re: x, y are non zero integers: Is x^y < y^x [#permalink] New post 02 Nov 2012, 13:28
Expert's post
prep wrote:
x, y are non zero integers: Is x^y < y^x

(1) x<y
(2) x and y are consecutive integers

What's the fastest method to solve this problem?


I'd say number plugging.

For (1)+(2) if x=1 and y=2, then the answer is YES but if x=3 and y=4, then the answer is NO. Not sufficient.

Answer: E.

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Intern
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Joined: 15 Oct 2011
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Kudos [?]: 3 [0], given: 21

Re: x, y are non zero integers: Is x^y < y^x [#permalink] New post 02 Nov 2012, 14:36
Brilliant, thanks! I was trying negative no's and using Y as -2 to evaluate all alternatives!

Bunuel wrote:
prep wrote:
x, y are non zero integers: Is x^y < y^x


(1) x<y
(2) x and y are consecutive integers

What's the fastest method to solve this problem?


I'd say number plugging.

For (1)+(2) if x=1 and y=2, then the answer is YES but if x=3 and y=4, then the answer is NO. Not sufficient.

Answer: E.
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Re: x, y are non zero integers: Is x^y < y^x [#permalink] New post 22 Jul 2014, 03:54
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Re: x, y are non zero integers: Is x^y < y^x   [#permalink] 22 Jul 2014, 03:54
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