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Math riddle, eliminating 2 of 3 answers with limited info

  1. Sep 18, 2010 #1
    remove wrong forum/problem solved though

    thanks
     
    Last edited: Sep 18, 2010
  2. jcsd
  3. Sep 18, 2010 #2

    eumyang

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    Homework Helper

    You may be thinking too hard.

    Consider this: what if YOU, the person asking the question, were also thinking of a number or numbers in your head, and your question involves a COMPARISON between the number/numbers you're thinking of and the number the other person wrote down?


    69
     
  4. Sep 18, 2010 #3
    You can ask "Is the logaritm of 10 with this number as a base is bigger then 3?". Answer will be
    -yes if it is 2 (because log(10) by base 2 equals 3,32)
    -no for 3 (log(10) by base 3 equals 2,1)
    -I don't know for 1 (because log(10) by base 1 is undefined).
     
  5. Sep 18, 2010 #4
    Thanks so much, it has been frustrating me so much lol.

    I never thought of using logs it's just something that I personally don't use in math that often.
    I knew/felt like the "I don't know" had something to do with it, genius of you to get one of the results to undefined
     
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