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Source: — Data Sufficiency |
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Re: DS Powerprep

by jayhawk2001 » Tue May 22, 2007 4:38 pm
Cybermusings wrote:If z^n = 1 what is the value of z?

1) n is a non-zero integer

2) z > 0
Is it C?

1 - insufficient. If n is non-zero, z is +1 or -1

2 - insufficient. If z > 0, there are 2 possibilities: z=n=1 or n=0,z=any num

Together, we can solve for z = 1

Hence C
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by Cybermusings » Tue May 22, 2007 10:51 pm
Yup it's C
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