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# What is the integer value of J? 1) | J | = J^-1 2) J^J = 1

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Manager
Joined: 01 Apr 2006
Posts: 176
What is the integer value of J? 1) | J | = J^-1 2) J^J = 1 [#permalink]

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16 Sep 2008, 21:22
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What is the integer value of J?

1) | J | = J^-1

2) J^J = 1

--== Message from GMAT Club Team ==--

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Director
Joined: 14 Aug 2007
Posts: 695

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16 Sep 2008, 22:18
D

1) |j| = 1/j => j has to be +1

2) since 0 to the power 0 is undefined, only j = 1 satisfies j^j = 1
Intern
Joined: 21 Jun 2008
Posts: 9

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16 Sep 2008, 23:10
anybody have the actual answer to this question?
Director
Joined: 25 Oct 2006
Posts: 588

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16 Sep 2008, 23:36
IMO A.

B: j*j =1 so j can be +1 or -1. Not suffice
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Retired Moderator
Joined: 18 Jul 2008
Posts: 897

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17 Sep 2008, 15:27
Picked A at first, but now I see why B would work as well.

alpha_plus_gamma wrote:
D

1) |j| = 1/j => j has to be +1

2) since 0 to the power 0 is undefined, only j = 1 satisfies j^j = 1
VP
Joined: 17 Jun 2008
Posts: 1477

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17 Sep 2008, 22:57
D for me as well with the same explanation as from alpha_plus_gama.
Manager
Joined: 01 Apr 2006
Posts: 176

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18 Sep 2008, 11:04
OA is D.

The solution said that 0^0 is a non-existent value, therefore, made S2 a sufficient statement. This is the part that I missed originally.
VP
Joined: 30 Jun 2008
Posts: 1007

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19 Sep 2008, 00:58
0^0 is indefinite on GMAT ?

http://mathforum.org/dr.math/faq/faq.0.to.0.power.html

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Re: DS -   [#permalink] 19 Sep 2008, 00:58
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