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gmat prep question

This topic has 1 member reply
yvonne12 Master | Next Rank: 500 Posts Default Avatar
Joined
07 Feb 2007
Posted:
144 messages

gmat prep question

Post Fri Apr 20, 2007 3:09 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    if M and N are positive integers and mn=k is M+N=K+1

    1. m=1

    2. k= is a prime number

    the answer is D

    I want to know how I should evaluate this q.

    I dont know how it can be D

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    jayhawk2001 Community Manager
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    Post Fri Apr 20, 2007 4:02 pm
    yvonne12 wrote:
    if M and N are positive integers and mn=k is M+N=K+1

    1. m=1

    2. k= is a prime number

    the answer is D

    I want to know how I should evaluate this q.

    I dont know how it can be D
    1 - sufficient. mn = k. So, if m = 1, n = k. So m+n = 1+k

    2 - sufficient. If k is prime, the only 2 factors are k and 1. So only 2
    values are possible. {m=k, n=1} or {m=1, n=k}. Both yield k+1 as sum

    Hence D.

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