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You are here: Home / Official GMAT Guides / 2018 Official GMAT Guide /

Question 288 Data Sufficiency 2018 GMAT Official Guide

Question 288 Data Sufficiency 2018 GMAT Official Guide

 
Video explanation: In the multiplication table above, each letter represents an…

Comments

  1. Sudhanshu Singh says

    May 28, 2019 at 4:29 AM

    why can not we do this a*c=c
    which implies a*c-c=0
    which implies c(a-1)=0 which in turn c=0 and a=1 what is wrong in this approach

    Reply
    • GMAT Quantum says

      June 6, 2019 at 4:45 PM

      Hi Sudhanshu,

      You are correct that we can translate statement 1 to: $c(a-1)=0$. However, the conclusion is that either $c=0$ or $a=1$, the word “or” is important. This means that if $a=1$, then statement 1 will hold true, however then $c$ could take on any value. For example, $c$ could be $1$, $2$, or for that any number. This means we do not have a unique value for $c$, and therefore statement 1 alone is insufficient.

      Dabral

      Reply

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