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VP
Joined: 30 Jun 2008
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Source: GMATPrep I would like to understand the concept [#permalink]
 10 Oct 2008, 09:01
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Source: GMATPrep I would like to understand the concept behind this.
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SVP
Joined: 05 Jul 2006
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(n-1)(n)(n+1) are 3 consecutives , 24 = 2^3*3 from 1 if n is not dev by 2 thus n-1, n+1 are even ( 2,3,4) ( 4,5,6) (6,7,8) 8/24 r = 8 , r = 0 , r = 2 from 2 (1,2,3) ( 3,4,5) 0r ( 4,5,6) r = 4 or 15 or 0 insuff both together (4,5,6) and 6,7,8 sutisfies 1,2 however yeild r = 0 C is my answer Thanks Bruce for the wake up call i owe u one 
Last edited by yezz on 10 Oct 2008, 11:05, edited 2 times in total.
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VP
Joined: 30 Jun 2008
Posts: 1050
Followers: 8
Kudos [?]:
214
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yezz wrote: (n-1)(n)(n+1) are 3 consecutives ,
24 = 2^3*3
from 1
if n is not dev by 2 thus
n-1, n+1 are even ( 2,3,4) ( 4,5,6) (6,7,8)
24/24 r = 0 , 120/24 r = 5 , r = 14
from 2
(1,2,3) ( 3,4,5) 0r ( 4,5,6)
r = 7 or 5/2 or 5 insuff
both together
(4,5,6) and 6,7,8 sutisfies 1,2 however yeild different r
E I think you misread the problem Yezz. There is no "n" in the question.
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Senior Manager
Joined: 21 Apr 2008
Posts: 275
Location: Motortown
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(n^2 -1) = 24x + R
1. n is not divisible by 2
N is odd
To satisfy the equation, n should be atleast 5 with R = 0
n = 5 -> R = 0
n = 7 -> R = 0
n = 9 -> R = 8
Not Sufficient
2. n is not divisible by 3
N is not 3,6,9,12...
To satisfy the equation, n should be atleast 5 with R = 0
n = 5 -> R = 0
n = 7 -> R = 0
n = 8 -> R = 15
Not Sufficient
Together:
Intersection of {5,7,9,11,13,15,17...} and {5,7,8,10,11,13,17....}
{5,7,11,13,17......}
With each integer, R = 0
so, answer is C
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VP
Joined: 30 Jun 2008
Posts: 1050
Followers: 8
Kudos [?]:
214
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LiveStronger wrote: (n^2 -1) = 24x + R
1. n is not divisible by 2
N is odd
To satisfy the equation, n should be atleast 5 with R = 0
n = 5 -> R = 0
n = 7 -> R = 0
n = 9 -> R = 8
Not Sufficient
2. n is not divisible by 3
N is not 3,6,9,12...
To satisfy the equation, n should be atleast 5 with R = 0
n = 5 -> R = 0
n = 7 -> R = 0
n = 8 -> R = 15
Not Sufficient
Together:
Intersection of {5,7,9,11,13,15,17...} and {5,7,8,10,11,13,17....}
{5,7,11,13,17......}
With each integer, R = 0
so, answer is C Thank you LiveStronger  +1 for you
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"You have to find it. No one else can find it for you." - Bjorn Borg
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