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DS: GMAT Prep [#permalink] New post 16 Jul 2006, 18:49
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 [#permalink] New post 16 Jul 2006, 18:52
(C).

I. z can be -1, 1..

II. z can be any no. and n can be 0..

combining
z can be only 1.
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 [#permalink] New post 16 Jul 2006, 19:45
1. z is 1 or -1.
2. if n = 0, z is any number. if n =1, z is 1. if n = -1, z is also 1.

togather, irrespective the values (1 or -1) of n, z can only be 1.
  [#permalink] 16 Jul 2006, 19:45
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