Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Math riddle, eliminating 2 of 3 answers with limited info

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

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


    User Avatar
    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?

  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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook