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

Self-Referential Aptitude test (brain teaser)

  1. Oct 27, 2011 #1
  2. jcsd
  3. Oct 29, 2011 #2
    Clever puzzle! Yeah, post the answer, but not yet, give us a couple weeks to work on it.
  4. Oct 30, 2011 #3
    Ok. Yeah, it's a tough one.
  5. Oct 30, 2011 #4


    User Avatar
    Gold Member

    You can always post the answer within the "spoiler tags" and then people can view it as they complete the puzzle.
  6. Oct 31, 2011 #5

    Here ya go

    1.D 2.A 3.D 4.B 5.E 6.D 7.D 8.E 9.D 10.A 11.B 12.A 13.D 14.B 15.A 16.D 17.B 18.A 19.B 20.E
  7. Nov 7, 2011 #6


    User Avatar
    Science Advisor
    Homework Helper

    Got it.


    At least mine matches Galteeth's, so that's a good sign.

    Oh, he posted the solution, so that's an even better sign.
  8. Nov 8, 2011 #7
    Cool, how did you solve it?
  9. Nov 9, 2011 #8


    User Avatar
    Science Advisor
    Homework Helper

    #7 and #8 are the key questions. It bothered me to have more than one correct answer to #7, yet choose only one of them based on #2 (6 and 7 were the only two left that could possibly be identical). I would have liked #8 to be A or C instead of E. Yet it didn't bother me to pick an answer to #19 based entirely on other questions.

    But, once I got to the point of counting how many times I chose each letter, it became pretty clear that #8 had to be E. In fact, I had to change my answer from C to E when C became impossible and got lucky that #7 was correct (and #2 and #6 and #17) regardless of which way I went. But, even not being sure of the answer to #8, the answer had to be an even number, which helped answer other questions.
  10. Jan 11, 2012 #9
    Oh god..It is really a tough one..I can't answer all question but can some of them..The questions are too tricky and needs good intelligence..I like it..
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook