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13 Apr 2006, 15:49
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What is the value of n?
1) n^2 - n = n - n^2
2) -n^2 = n
1) n^2 - n = n - n^2
2) -n^2 = n
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13 Apr 2006, 16:21
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What is the value of n?
1) n^2 - n = n - n^2
2) -n^2 = n
Statement 1: 2n^2 = 2n
n^2 = n
This would be insufficient. because sqrt(n^2) could be positive or negative.
Statement 2: sufficient. This tells us that n = -1.
B
1) n^2 - n = n - n^2
2) -n^2 = n
Statement 1: 2n^2 = 2n
n^2 = n
This would be insufficient. because sqrt(n^2) could be positive or negative.
Statement 2: sufficient. This tells us that n = -1.
B
13 Apr 2006, 17:34
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jcgoodchild
B doesnt tell us that n= -1!!
- n^2 = n (given)
or, n^2 + n =0
or n(n+1) = 0
Thus n = 0 or n =-1! Hence we cannot conclusively prove that n ==-1! (this wud have wored if the question was modifird to say that n was non zero or n was positive)!
Hence E
