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

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Manager
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If z^n = 1, what is the value of z? [#permalink]

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22 Nov 2004, 10:14
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If z^n = 1, what is the value of z?

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

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-z-n-1-what-is-the-value-of-z-135081.html
[Reveal] Spoiler: OA
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22 Nov 2004, 10:47
z^n = 1

happens if z=1 whatever n value, OR if n=0 whatever z value

Statement 1 : n is a nonzero integer, so z= 1 enough

Statement 2 : z>0 could be z=1 or not so not enough

My choice is A
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22 Nov 2004, 11:45
Ill go with E..

statement 1.. if n=1, z=1, of n=2, then z= +1 or -1. hence, insuff.

statement 2-- very much insuff. no doubt.

combining, Z^n=1, since n is not 0, there is no way of finding out Z ..
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22 Nov 2004, 13:26
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I'll pick C here.

1) Z could be +1 or (-1) .. we don't know.

2) Z>0 so n=0 or z=1.

together, Z=1.
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22 Nov 2004, 13:56
After reading this I have a fundamental question - since this question can be rewritten as z= 1^1/n, isn't z always 1
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23 Nov 2004, 11:20
After reading this I have a fundamental question - since this question can be rewritten as z= 1^1/n, isn't z always 1

rthothad - z can be 1 or -1 if n is even.

Yep the ans is C.
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Re: Z^n = 1, What is the value of Z? 1. n is a nonzero integer [#permalink]

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13 Sep 2013, 07:32
Hello from the GMAT Club BumpBot!

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Re: If z^n = 1, what is the value of z? [#permalink]

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13 Sep 2013, 08:56
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If z^n = 1, what is the value of z?

(1) n is a non zero integer --> $$1^{any \ integer}=1$$ and also $$(-1)^{even}=1$$, so $$z$$ can be 1 or -1. Not sufficient.

(2) z > 0 --> any nonzero number to the power of 0 is 1, so if $$n=0$$ then $$z$$ can be any non-zero number (any positive number in our case as given that $$z>0$$). Not sufficient.

(1)+(2) $$n$$ is a nonzero integer and $$z>0$$ implies that $$z$$ can equal to 1 only. Sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-z-n-1-what-is-the-value-of-z-135081.html
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Re: If z^n = 1, what is the value of z? [#permalink]

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09 Sep 2015, 06:50
Hello from the GMAT Club BumpBot!

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Re: If z^n = 1, what is the value of z? [#permalink]

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09 Sep 2015, 18:19
Hi All,

This exponent rule 'concept' is something of a classic in the realm of standardized testing - it serves as a relatively simple way to assess a Test Taker's 'thoroughness of understanding' on a specific concept:

Here, the concept is "using exponent rules, and one number raised to one exponent, how many different ways can you get to the number 1?"

The first ('obvious') answer is "1 raised to any power = 1"

eg. 1^2, 1^50, 1^(-3), etc.

There are OTHER possibilities though. If your base is -1, then any EVEN exponent will lead us to a total of 1...

eg. (-1)^2, (-1)^4, (-1)^(-2), etc.

Finally, raising any number to the '0 power' will also give us a total of 1...

eg. 1^0, 537^0, (-13)^0, etc.

When dealing with this specific situation, it's important to pay careful attention to the information that you're given. What do you really know about the 'base' and the 'power' involved? If you don't know anything, then you have to consider all of the above possibilities.

GMAT assassins aren't born, they're made,
Rich
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Re: If z^n = 1, what is the value of z?   [#permalink] 09 Sep 2015, 18:19
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