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OG - DS - #146

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jp
 Post subject: OG - DS - #146
 Post Posted: Sat May 05, 2007 10:47 am 
DS question

is n an integer?
1) n^2 is an integer

in the statement above, can anyone provide me with an example of n not being an integer when n^2 is an integer? thanks.
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Saurabh Malpani
 Post subject: Re: exponents & roots (OG - Orange, pg 290, #146)
 Post Posted: Sat May 05, 2007 11:02 am 
JP,

Sqrt (2) , (2)^1/2 , for the matter square root of any non- perfect Square number!!! will not be an integer.

I hope that helps!!

jp wrote:
DS question

is n an integer?
1) n^2 is an integer

in the statement above, can anyone provide me with an example of n not being an integer when n^2 is an integer? thanks.
Top 
carrion185
 Post subject:
 Post Posted: Wed May 09, 2007 10:53 pm 
Saurabh Malpani, can you please explain you logic ? JP's question was:

"is n an integer?
1) n^2 is an integer

in the statement above, can anyone provide me with an example of n not being an integer when n^2 is an integer? "

Your example of "Sqrt (2) , (2)^1/2" doesn't seem to be an example of how a (non-integer n)^2 can equal an integer. Thanks.
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GMAT 5/18
 Post subject:
 Post Posted: Wed May 09, 2007 11:35 pm 
Initial question by JP:

DS question

is n an integer?
1) n^2 is an integer

in the statement above, can anyone provide me with an example of n not being an integer when n^2 is an integer? thanks.

If n = 1.414.....(the square root of 2), then n is not an integer when n^2 is. As Saurabh mentioned, this works with any non-perfect square situation, such as root3, root5, root6, root7, etc. Notice that with a perfect square, such as the number 4, this does not hold true.

Hope this helps!
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dbernst
 Post subject:
 Post Posted: Thu May 10, 2007 12:19 am 
Offline
ManhattanGMAT Staff


Posts: 304
Good work! Ya'll are making my job easier!
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GMAT 5/18
 Post subject:
 Post Posted: Thu May 10, 2007 12:01 pm 
GMAT 5/18 thanks for the explanation. was helpful...
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