GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Aug 2018, 09:41

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# GMAT Prep - 3

Author Message
Manager
Joined: 14 Jan 2006
Posts: 88
Schools: HKUST

### Show Tags

14 Oct 2008, 14:46
try.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

Attachments

untitled2.JPG [ 58.52 KiB | Viewed 1300 times ]

Retired Moderator
Joined: 05 Jul 2006
Posts: 1731
Re: GMAT Prep - 3  [#permalink]

### Show Tags

14 Oct 2008, 15:31
each obviously not suff

both

n not = 0 and z >0 ie: +ve

THUS Z CAN ONLY = 1
Senior Manager
Joined: 21 Apr 2008
Posts: 265
Location: Motortown
Re: GMAT Prep - 3  [#permalink]

### Show Tags

14 Oct 2008, 15:42
C

1: z can be -1 or 1
2: z>0

Together z =1
Director
Joined: 23 May 2008
Posts: 739
Re: GMAT Prep - 3  [#permalink]

### Show Tags

14 Oct 2008, 22:17
IMO A.

cant be A because Z can be 1 or -1
Intern
Joined: 23 Sep 2008
Posts: 15
Re: GMAT Prep - 3  [#permalink]

### Show Tags

14 Oct 2008, 22:39
I think this should be C.
Director
Joined: 27 Jun 2008
Posts: 505
WE 1: Investment Banking - 6yrs
Re: GMAT Prep - 3  [#permalink]

### Show Tags

15 Oct 2008, 07:04
would go with C

a - you get - or + 1
b - not suff
Senior Manager
Joined: 04 Aug 2008
Posts: 362
Re: GMAT Prep - 3  [#permalink]

### Show Tags

15 Oct 2008, 07:37
Can someone think of an example where z (-1) raised to any power (n) can produce produce 1 (as in A)

I got stuck on this

Z^n=1

Z=1 Z^1=1

I see that z can produce 1 only if z=1 but not -1

Therefore, A is sufficient until proven wrong
_________________

The one who flies is worthy. The one who is worthy flies. The one who doesn't fly isn't worthy

Manager
Joined: 09 Oct 2008
Posts: 93
Re: GMAT Prep - 3  [#permalink]

### Show Tags

18 Oct 2008, 23:07
z^n = 1
z^n= z^0

means n =0 but A says N isnot equal to 0 means z = 1 only..or z= -1^2 =1...WE GET 2 value of z

B;now z is +ve but not suff.

A+B - zis def. 1 so Cis answer

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: GMAT Prep - 3 &nbs [#permalink] 18 Oct 2008, 23:07
Display posts from previous: Sort by

# GMAT Prep - 3

Moderator: chetan2u

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.