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18 Jun 2013, 15:49
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
45% (01:14) correct
55%
(00:57)
wrong
based on 156
sessions
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18 Jun 2013, 15:56
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N is an integer . Is N negative ?
A) \(|N|= -N\)
That is true if \(N\leq{0}\)
Not sufficient to say that is negative (could be 0).
B) \(N^4=N^2\)
\(N^4-N^2=0\) \(N^2(N^2-1)=0\) so N could be 0,1 or -1.
Not sufficient
1+2) N could still be 0 or -1. Not sufficient
A) \(|N|= -N\)
That is true if \(N\leq{0}\)
Not sufficient to say that is negative (could be 0).
B) \(N^4=N^2\)
\(N^4-N^2=0\) \(N^2(N^2-1)=0\) so N could be 0,1 or -1.
Not sufficient
1+2) N could still be 0 or -1. Not sufficient
18 Jun 2013, 17:51
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This may be a silly question but could you go over #1 in a bit more depth?
Thanks!
Thanks!
Zarrolou
N is an integer . Is N negative ?
A) \(|N|= -N\)
That is true if \(N\leq{0}\)
Not sufficient to say that is negative (could be 0).
B) \(N^4=N^2\)
\(N^4-N^2=0\) \(N^2(N^2-1)=0\) so N could be 0,1 or -1.
Not sufficient
1+2) N could still be 0 or -1. Not sufficient
A) \(|N|= -N\)
That is true if \(N\leq{0}\)
Not sufficient to say that is negative (could be 0).
B) \(N^4=N^2\)
\(N^4-N^2=0\) \(N^2(N^2-1)=0\) so N could be 0,1 or -1.
Not sufficient
1+2) N could still be 0 or -1. Not sufficient
