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At least one solution-Postive and negatives

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Manager
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Joined: 09 Jun 2011
Posts: 146
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Kudos [?]: 12 [0], given: 1

At least one solution-Postive and negatives [#permalink] New post 12 Sep 2011, 10:01
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

33% (01:05) correct 67% (00:31) wrong based on 6 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
Manager
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Joined: 09 Jun 2011
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Re: At least one solution-Postive and negatives [#permalink] New post 12 Sep 2011, 22:49
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
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Manager
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Joined: 30 Sep 2009
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Re: At least one solution-Postive and negatives [#permalink] New post 13 Sep 2011, 00:13
1
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this question is a bit tricky... never encountered such before...

After seeing the soln understood the question....

Nice question :)

+1
Re: At least one solution-Postive and negatives   [#permalink] 13 Sep 2011, 00:13
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