• EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • 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
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • 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
  • 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
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • 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
  • 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

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
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    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??

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    jayhawk2001 Community Manager
    Joined
    28 Jan 2007
    Posted:
    789 messages
    Followed by:
    1 members
    Thanked:
    30 times
    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

    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...

    Best Conversation Starters

    1 lheiannie07 116 topics
    2 LUANDATO 62 topics
    3 swerve 62 topics
    4 ardz24 61 topics
    5 AAPL 58 topics
    See More Top Beat The GMAT Members...

    Most Active Experts

    1 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    172 posts
    2 image description Scott@TargetTestPrep

    Target Test Prep

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

    EMPOWERgmat

    131 posts
    4 image description EconomistGMATTutor

    The Economist GMAT Tutor

    127 posts
    5 image description GMATGuruNY

    The Princeton Review Teacher

    125 posts
    See More Top Beat The GMAT Experts