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Gennadiy

Post subject: Re: GMAT Number Theory Posted: Tue Oct 11, 2011 12:13 pm 

Joined: Sun May 30, 2010 2:23 am Posts: 498


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questioner

Post subject: Re: GMAT Number Theory Posted: Fri Nov 04, 2011 7:27 am 

Joined: Sun May 30, 2010 3:15 am Posts: 424

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).


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Gennadiy

Post subject: Re: GMAT Number Theory Posted: Fri Nov 04, 2011 7:34 am 

Joined: Sun May 30, 2010 2:23 am Posts: 498


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questioner

Post subject: Re: GMAT Number Theory Posted: Thu Nov 10, 2011 6:06 pm 

Joined: Sun May 30, 2010 3:15 am Posts: 424

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.


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Gennadiy

Post subject: Re: GMAT Number Theory Posted: Thu Nov 10, 2011 6:14 pm 

Joined: Sun May 30, 2010 2:23 am Posts: 498


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dave

Post subject: Re: GMAT Number Theory Posted: Thu Apr 12, 2012 2:20 am 

Joined: Mon Nov 26, 2012 5:39 pm Posts: 11

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?


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Gennadiy

Post subject: Re: GMAT Number Theory Posted: Thu Apr 12, 2012 2:44 am 

Joined: Sun May 30, 2010 2:23 am Posts: 498


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radz1806

Post subject: Re: GMAT Number Theory Posted: Tue Aug 21, 2012 3:17 am 

Joined: Tue Aug 21, 2012 3:07 am Posts: 1

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


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Gennadiy

Post subject: Re: GMAT Number Theory Posted: Wed Aug 22, 2012 11:22 am 

Joined: Sun May 30, 2010 2:23 am Posts: 498


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fedana

Post subject: Re: GMAT Number Theory Posted: Wed Oct 31, 2012 5:07 pm 

Joined: Mon Nov 26, 2012 4:59 pm Posts: 8

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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