• Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • examPAL
    Most awarded test prep in the world
    Now free for 30 days

    Available with Beat the GMAT members only code

    MORE DETAILS
    examPAL
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors

gmat prep question

This topic has 2 member replies
yvonne12 Master | Next Rank: 500 Posts Default Avatar
Joined
07 Feb 2007
Posted:
144 messages

gmat prep question

Post Sun Apr 15, 2007 6:00 pm
if z^n=1 whaty is the value of z

1. n is a non zero integer

2. z>0

I thought it was A since, z^n=1 and n is non zero z must be 1 becuase n could've been 0.

why is it both??

  • +1 Upvote Post
  • Quote
  • Flag
yvonne12 Master | Next Rank: 500 Posts Default Avatar
Joined
07 Feb 2007
Posted:
144 messages
Post Mon Apr 16, 2007 4:30 pm
yes, of course, I forgot about the sign difference. Geez thats something that I should automatically know by now.... 13 more days to go...

  • +1 Upvote Post
  • Quote
  • Flag
jayhawk2001 Community Manager
Joined
28 Jan 2007
Posted:
789 messages
Followed by:
1 members
Upvotes:
30
Post Sun Apr 15, 2007 9:00 pm
yvonne12 wrote:
if z^n=1 whaty is the value of z

1. n is a non zero integer

2. z>0

I thought it was A since, z^n=1 and n is non zero z must be 1 becuase n could've been 0.

why is it both??
1 tells us that z can be +1 or -1. Based on whether n is even or odd,
we can get z^n = 1. Hence insufficient.

2 tells us that z > 0 which is insufficient by itself. If n is zero, z^n =1 for
any value of z > 0

Taking 1 and 2, we get z = +1.

Hence C

  • +1 Upvote Post
  • Quote
  • Flag

Best Conversation Starters

1 lheiannie07 108 topics
2 ardz24 67 topics
3 Roland2rule 63 topics
4 LUANDATO 53 topics
5 swerve 46 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description GMATGuruNY

The Princeton Review Teacher

143 posts
2 image description Jeff@TargetTestPrep

Target Test Prep

119 posts
3 image description Rich.C@EMPOWERgma...

EMPOWERgmat

116 posts
4 image description Scott@TargetTestPrep

Target Test Prep

101 posts
5 image description Max@Math Revolution

Math Revolution

86 posts
See More Top Beat The GMAT Experts