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A Radical Radical

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as2764
 Post subject: A Radical Radical
 Post Posted: Thu Feb 17, 2011 10:49 am 
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Course Students


Posts: 65
what is the most efficient way to solve this problem? the answer in the CAT explanation needs an additional step like putting x = 6y:

If k and x are positive integers and x is divisible by 6, which of the following CANNOT be the value of ?
a. 24k * sqrt(3)
b. 24 * sqrt(k)
c. 24 * sqrt(3k)
d. 24 * sqrt(6k)
e. 72 * sqrt(k)

appreciate instructor suggestions. thanks

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Ashish
Share why wrong answer(s) are not right than just stating why the right one is.
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jnelson0612
 Post subject: Re: A Radical Radical
 Post Posted: Thu Feb 17, 2011 6:46 pm 
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ManhattanGMAT Staff


Posts: 1857
Please see this thread: a-radical-radical-t2786.html

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Jamie Nelson
ManhattanGMAT Instructor
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as2764
 Post subject: Re: A Radical Radical
 Post Posted: Fri Feb 18, 2011 8:37 am 
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Course Students


Posts: 65
thanks! -- i was hesitant in posting the problem until i searched for it and yet couldn't find any threads.

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Ashish
Share why wrong answer(s) are not right than just stating why the right one is.
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jnelson0612
 Post subject: Re: A Radical Radical
 Post Posted: Sat Feb 19, 2011 10:26 pm 
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ManhattanGMAT Staff


Posts: 1857
Great, my pleasure!

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Jamie Nelson
ManhattanGMAT Instructor
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