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Source: GMATPrep I would like to understand the concept [#permalink]
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10 Oct 2008, 08:01
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Re: DS : Reminder [#permalink]
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10 Oct 2008, 09:35
(n1)(n)(n+1) are 3 consecutives , 24 = 2^3*3 from 1 if n is not dev by 2 thus n1, 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, 10:05, edited 2 times in total.



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Re: DS : Reminder [#permalink]
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10 Oct 2008, 09:47
yezz wrote: (n1)(n)(n+1) are 3 consecutives ,
24 = 2^3*3
from 1
if n is not dev by 2 thus
n1, 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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Re: DS : Reminder [#permalink]
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10 Oct 2008, 15:09
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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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Re: DS : Reminder [#permalink]
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10 Oct 2008, 18:16
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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