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GMAT Prep question - please explain

This topic has 1 member reply
dsuna Junior | Next Rank: 30 Posts Default Avatar
Joined
17 Mar 2007
Posted:
14 messages

GMAT Prep question - please explain

Post Sat Mar 24, 2007 11:04 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    If k#0, 1, or -1, is 1/k>0?

    1. 1/(k-1)>0
    2. 1/(k+1)>0

    Ans. A

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    jayhawk2001 Community Manager
    Joined
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    Post Sat Mar 24, 2007 12:22 pm
    1 - If 1/(k-1) > 0, then k > 1 and hence positive. So, 1/k > 0.
    Sufficient

    2 - If 1/(k+1) > 0, then k > -1. K is not given to be an integer and
    can take values -0.5, 0.5, 2 etc. So, 1/k can be positive or negative.
    Insufficient.

    Hence A

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