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Updated on: 17 Sep 2007, 19:33
Originally posted by somethingbetter on 17 Sep 2007, 16:08.
Last edited by somethingbetter on 17 Sep 2007, 19:33, edited 2 times in total.
Last edited by somethingbetter on 17 Sep 2007, 19:33, edited 2 times in total.
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Guys, could anybody explain concept of absolute values. How to start analyzing these Questions? See how I get stuck--- if we take the previous Q(in this forum) where DS problem says-
If n is not equal to 0, is |n|>4
(1) n^2>16
(2) 1/|n| > n
since all absolute values are always positive, n, actually, could also be negative so
[ Ac/Statement 1 ]-
+n>4 and
-n>4 [ if we multiply both sides by -ve sign, we invert the inequality sign (right??) ]means: n<-4
how is that possible for n to be bigger than 4 and smaller than -4??????????
Obviously, I made some fundamental mistake but what's that??
If n is not equal to 0, is |n|>4
(1) n^2>16
(2) 1/|n| > n
since all absolute values are always positive, n, actually, could also be negative so
[ Ac/Statement 1 ]-
+n>4 and
-n>4 [ if we multiply both sides by -ve sign, we invert the inequality sign (right??) ]means: n<-4
how is that possible for n to be bigger than 4 and smaller than -4??????????
Obviously, I made some fundamental mistake but what's that??
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Hi there,
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17 Sep 2007, 19:44
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St1:
(n+4)(n-4) > 0
n > 4 and n <4> n
LHS 1/|n| is always positive. But n could either be a positive fraction, or a negative value.
If n = 1/2, then 1/|n| > n but |n| <4> n but |n| > 4
Insufficient.
Ans A
(n+4)(n-4) > 0
n > 4 and n <4> n
LHS 1/|n| is always positive. But n could either be a positive fraction, or a negative value.
If n = 1/2, then 1/|n| > n but |n| <4> n but |n| > 4
Insufficient.
Ans A
