800score.comhttps://www.800score.com/forum/ GMAT Number Theoryhttps://www.800score.com/forum/viewtopic.php?f=3&t=91 Page 2 of 3

 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 bestatement 1) first statement needs to be an integer as n is a multiple of m/2so 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 NOor n/m can be 1,2,3,4,.......---> integers yesthus Not sufficientstatement 2)it states that n/2m is an integernow separate it as (1/2) * (n/m) and this is an integerthus for this to be an integer naturally (n/m) has to be an integer which cancels out the 2 in the denominator------> yes onlyThus 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)

 Page 2 of 3 All times are UTC - 5 hours [ DST ] Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Grouphttps://www.phpbb.com/