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GMAT Number Theory https://www.800score.com/forum/viewtopic.php?f=3&t=91 
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Author:  Gennadiy [ Tue Oct 11, 2011 12:13 pm ] 
Post subject:  Re: GMAT Number Theory 
Author:  questioner [ Fri Nov 04, 2011 7:27 am ] 
Post subject:  Re: GMAT Number Theory 
Let n = 2, m = 5. 2m = 10 is a divisor of n or 2, but n²ª (or 4ª) is not a multiple of mª (or 5ª). 
Author:  Gennadiy [ Fri Nov 04, 2011 7:34 am ] 
Post subject:  Re: GMAT Number Theory 
Author:  questioner [ Thu Nov 10, 2011 6:06 pm ] 
Post subject:  Re: GMAT Number Theory 
In your explanation of why answer A is insufficient, you give 2 examples of why the answer is no, which is an answer. You might inlcude an example of when the answer is yes sometimes and no other times, making A insufficient. 
Author:  Gennadiy [ Thu Nov 10, 2011 6:14 pm ] 
Post subject:  Re: GMAT Number Theory 
Author:  dave [ Thu Apr 12, 2012 2:20 am ] 
Post subject:  Re: GMAT Number Theory 
Can you expand on the second point? I understand why if 2m is a divisor of n, then m is a divisor of n – but how do we get from there to understanding that n²ª is a multiple of m²ª? 
Author:  Gennadiy [ Thu Apr 12, 2012 2:44 am ] 
Post subject:  Re: GMAT Number Theory 
Author:  radz1806 [ Tue Aug 21, 2012 3:17 am ] 
Post subject:  Re: GMAT Number Theory 
A way to answer this question would be statement 1) first statement needs to be an integer as n is a multiple of m/2 so if you write it as n/(m/2) = 2(n/m) and this needs to be an integer for it to be an integer we have two options: thus n/m can be 1/2 > not an integer NO or n/m can be 1,2,3,4,.......> integers yes thus Not sufficient statement 2) it states that n/2m is an integer now separate it as (1/2) * (n/m) and this is an integer thus for this to be an integer naturally (n/m) has to be an integer which cancels out the 2 in the denominator> yes only Thus statement 2 is sufficient as if n is multiple of m then n^2 will also be a multiple of m 
Author:  Gennadiy [ Wed Aug 22, 2012 11:22 am ] 
Post subject:  Re: GMAT Number Theory 
Author:  fedana [ Wed Oct 31, 2012 5:07 pm ] 
Post subject:  Re: GMAT Number Theory 
On the GMAT, would the number 7 be considered a multiple of the number 3.5? I am wondering, whether when picking numbers for this problem, I could have picked n = 7 and m = 7 (since n is multiple of m/2, and 7 is (or not?) a multiple of 3.5) 
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