GMAT Integers

moneyman · Posted: Wed May 21, 2008 10:08 am Post subject: GMAT Integers

Help pls

mim3 · Posted: Wed May 21, 2008 2:03 pm Post subject:

I got C:

z^n= 1 and we need to find z.
if n is 0, z can be anything as anything^0= 1. If n is not 0, then z can be 1 or -1.

1. n is a non-zero integer.
So if n=2 (or any even postive integer)then z=1 or -1. Insufficient

2. z is greater than 0.
By itself, that doesn't tell us much. z could be anything if n=0 and we're not told anything about n. Insufficient.

1&2: from 1) z= 1 or -1. 2) z=+ Thus, z=1 Sufficent.

ektamatta · Posted: Sun May 25, 2008 3:56 pm Post subject: let me know

what is the answer? I think A is the answer

aatech · Posted: Sun May 25, 2008 6:10 pm Post subject:

I will go with C.. Same explanation as mim3