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Logic Resolution rule application

  1. Aug 7, 2013 #1
    1. The problem statement, all variables and given/known data
    Hi, there
    there is one question, which I find it to be solvable, but the answer is that it cannot be solved.
    Can someone explain me the answer given. I think there is a mistake on the underlined row, which leads to wrong answer.
    I am not sure, so if someone can help me I will be very grateful!


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Aug 7, 2013 #2

    NascentOxygen

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    Staff: Mentor

    i don't know this topic. But tracing back the pattern there seems an inconsequential typo, where that -d should be c. If you believe otherwise, please point out your reasoning and I'll take a closer look. :wink:
     
  4. Aug 7, 2013 #3
    Thank you for the reply, that was the same thing I noticed, and this is the solution given by the lecturer, that is why I am asking.
     
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