DS Powerprep

[Cybermusings]

If z^n = 1 what is the value of z?

1) n is a non-zero integer

2) z > 0

[jayhawk2001]

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

[Cybermusings]

Yup it's C