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Vithal
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DS: Factor 10 Jun 2005, 19:22
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Please explain your approach



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HIMALAYA
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DS: Factor 10 Jun 2005, 21:46
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Vithal
Please explain your approach
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it should be C and the reminder is zero since n is prime number.
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HongHu
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DS: Factor 10 Jun 2005, 21:48
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https://www.gmatclub.com/phpbb/viewtopic.php?p=107096
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tkirk32
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if n =1 then the equation = undefined.

does underfined equate to r = 0 ???

Thanks,
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Vithal
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DS: Factor 11 Jun 2005, 13:58
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tkirk32
if n =1 then the equation = undefined.

does underfined equate to r = 0 ???

Thanks,
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if n=1, then (n-1)*(n+1) = 0 => r =0
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tkirk32
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DS: Factor 11 Jun 2005, 14:06
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Vithal
tkirk32
if n =1 then the equation = undefined.

does underfined equate to r = 0 ???

Thanks,

if n=1, then (n-1)*(n+1) = 0 => r =0
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sorry, it is not underfined as numerator = 0. I was thinking denom = 0.

My bad.
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mandy
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DS: Factor 30 Jun 2005, 08:56
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tarungmat
C is it.
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Plz tarungmat Can you explain your approach and shows your work
thanks

regards

mandy
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I think the answer should be C

Case 1: n = 5, then (5-1) * (5 + 1) = 24. which is divisible by 24
Case 2: n = 11, then (11-1) * (11 + 1) = 120, which is again divisible by 24.
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tarungmat
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tarungmat
C is it.
Plz tarungmat Can you explain your approach and shows your work
thanks

regards

mandy
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Ok, we are interested in finding out the value of remainder.

Statement 1. 2 is not the factor of N. SO N can be 3, or 1 or 5 or x. The remainder will be different for all of these...so we can not say what the reaminder will be. This is insuffcient. so rule out A and D

Stetement 2: This is also insufficient. Take for example n= 7 and n= 8. u have different remainder for these values. SO rule out B.

Taken together, N can have values such as 5, 7,11. In all these cases u will get a fixed value of remainder, which is zero.

Point to be noted that in gmat statement is called sufficient only when it can provide you a unique fix value as a result.
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tarungmat
mandy
tarungmat
C is it.
Plz tarungmat Can you explain your approach and shows your work
thanks

regards

mandy

Ok, we are interested in finding out the value of remainder.

Statement 1. 2 is not the factor of N. SO N can be 3, or 1 or 5 or x. The remainder will be different for all of these...so we can not say what the reaminder will be. This is insuffcient. so rule out A and D

Stetement 2: This is also insufficient. Take for example n= 7 and n= 8. u have different remainder for these values. SO rule out B.

Taken together, N can have values such as 5, 7,11. In all these cases u will get a fixed value of remainder, which is zero.

Point to be noted that in gmat statement is called sufficient only when it can provide you a unique fix value as a result.
Show more



:) thanks Tarungmat for your clear explanation



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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