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At least one solution-Postive and negatives

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At least one solution-Postive and negatives [#permalink] New post 12 Sep 2011, 11:01
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Question Stats:

40% (01:05) correct 60% (00:42) wrong based on 0 sessions
Each of the following equations has at least one solution EXCEPT
–2n = (–2)-n
2-n = (–2)n
2n = (–2)-n
(–2)n = –2n
(–2)-n = –2-n

The term n is positive or negative nth power raised, in all the options.Its not multiplied by n or -n.

Please explain.
[Reveal] Spoiler: OA
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Manager
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Re: At least one solution-Postive and negatives [#permalink] New post 13 Sep 2011, 01:13
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this question is a bit tricky... never encountered such before...

After seeing the soln understood the question....

Nice question :)

+1
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Re: At least one solution-Postive and negatives [#permalink] New post 12 Sep 2011, 23:49
a) –2n = (–2)-n
b) 2-n = (–2)n
c) 2n = (–2)-n
d) (–2)n = –2n
e) (–2)-n = –2-n

for b,c, n=0 is a solution.
for d,e n=1 is a solution
IMO
[Reveal] Spoiler:
A
Re: At least one solution-Postive and negatives   [#permalink] 12 Sep 2011, 23:49
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