value of z

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Source: — Data Sufficiency |

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by cramya » Sun Apr 26, 2009 8:52 pm
If z^n=1, what is the value of z?

1. n is a nonzero integer
2. z>0


Stmt I

1^1= 1
-1^2 = 1
INSUFF

Stmt II

1^0=1
2^0=1
... so on

INSUFF

Together

z has to be 1

SUFF

Choose C

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by cubicle_bound_misfit » Sun Apr 26, 2009 8:53 pm
given Z^n = 1

there can be two case s for Z and N

i.e Z = +/- 1 and n >=0

or Z != +/- 1 and n = 0

stmt 1) n != 0 hence Z can only be +/- 1 not Suff

stmt 2) z>0; nothing about n -- Not Suff

together
n!= 0 and z>0 hence Z shud be 1... Suff.
Choose C
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