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Z^n =1 , what is the value of z 1. n is a nonzero integer 2.

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Z^n =1 , what is the value of z 1. n is a nonzero integer 2. [#permalink] New post 07 May 2006, 17:58
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Z^n =1 , what is the value of z
1. n is a nonzero integer
2. z>0
Manager
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 [#permalink] New post 07 May 2006, 19:09
i don't get it , could you please explain further.
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 [#permalink] New post 07 May 2006, 21:44
St1:
Insufficient. Could be -1^2 or 1^(anything).

St2:
Insufficient. Could be z^0.

Using St1 and St2:
We know z = 1. Sufficient.

Ans C
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 [#permalink] New post 07 May 2006, 23:40
Z^n =1 , what is the value of z
1. n is a nonzero integer
2. z>0

1) n is non zero so the only way z ^n = 1 is if Z = 1 suff

2) z>0 which means n = 0 for z^n= 1 so Z can be anything insuff

I think it is A OA please
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 [#permalink] New post 08 May 2006, 00:07
Answer is C


reason why it cannot be A is because

z can be 1 or -1 when n=2! (satistfies given eq and option 1)!
  [#permalink] 08 May 2006, 00:07
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Z^n =1 , what is the value of z 1. n is a nonzero integer 2.

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