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If Z^^n = 1 , what is value of z? (1) n is a nonzero integer

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If Z^^n = 1 , what is value of z? (1) n is a nonzero integer [#permalink] New post 16 Feb 2009, 20:12
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D
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If Z^^n = 1 , what is value of z?
(1) n is a nonzero integer
(2) z > 0
Senior Manager
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GMAT Tests User
Re: DS - Number properties - Is it one? [#permalink] New post 16 Feb 2009, 20:47
given Z^n = 1

stmt 1 : n is non integer so n < 0 or n >0

so z = 1 and n= 1 then z^n = 1
or z = -1 and n= 2 then z^n =1 .so Insufficient

Stmt 2:
z > 0 then for z any value and n=0 then Z^n =1.So in sufficient.

Combining both Z>0 and n is a non intger then yes Z =1 .

Ans c
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Re: DS - Number properties - Is it one? [#permalink] New post 22 Feb 2009, 02:44
IMO it should be B.
Here possible values of Z are -1,0,1.

1) n is non-zero, we dont know anything about Z. - not sufficient
2) Z>0. which means Z=1. 1^n is always 1. - sufficient.

What is OA?
Re: DS - Number properties - Is it one?   [#permalink] 22 Feb 2009, 02:44
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If Z^^n = 1 , what is value of z? (1) n is a nonzero integer

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