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the following must be

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the following must be

by sanju09 » Fri Jul 23, 2010 6:43 am
If n > 0 , which of the following must be true?
I. n² > 1
II. n - n² < 0
III. 2 n - 1 > 0
A. I only
B. II only
C. III only
D. I and II only
E. none

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by selango » Fri Jul 23, 2010 6:47 am
n^2>1

n=1/2,n^2<1

Not true

n-n^2<0

n^2-n>0

n(n-1)>0

n>0 or n>1

n may be 2 or 0.5

Not true

2n-1>0

2n>1-->n>1/2

n can be 0.6 or 0.2

Pick E
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by kvcpk » Fri Jul 23, 2010 6:49 am
sanju09 wrote:If n > 0 , which of the following must be true?
I. n² > 1
II. n - n² < 0
III. 2 n - 1 > 0
A. I only
B. II only
C. III only
D. I and II only
E. none

[spoiler]Source: majortests.com[/spoiler]
n=0.5 will fail I,II,III

pick E
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