brain teaser

• mystiv

  29 Sep 06, 19:29

  alright. a little brain teaser for you guys
  
  using the numbers 1, 5, 5 and 5, form an equation that would give the product 24. you have to use each number once, and mathematical signs once or never
  
  note: mathematical signs only include +, -, *, / and brackets
  
  understand?
• mystiv

  29 Sep 06, 20:33

  no one wanna give it a try?
• akinos

  29 Sep 06, 20:59

  (5 x 5) - 1^5 ?
• mystiv

  29 Sep 06, 22:25

  Originally posted by akinos:

  (5 x 5) - 1^5 ?

  no
  
  again, i emphasize that mathematical signs only include + - * / and ( )
  
  no power, no differentiation or whatever
• mystiv

  29 Sep 06, 22:44

  alright. another one. simpler this time
  
  
  
  the above picture shows a chessboard with 2 of its edges removed. is it possible to arrange 31 dominoes so that each one covers exactly 2 squares?
  
  
  
  and do try to find an explanation instead of just trying out all the possible ways
• akinos

  30 Sep 06, 00:52

  oh i see... then it* will be (5 - 1/5) x 5
  
  edited: i lazy to explain and i dun even bother.. i prefer the traditional way of slowing putting in one by one xD.
• mystiv

  1 Oct 06, 00:02

  Originally posted by akinos:

  oh i see... then it* will be (5 - 1/5) x 5
  
  edited: i lazy to explain and i dun even bother.. i prefer the traditional way of slowing putting in one by one xD.

  answer to the 1st question is correct
• mystiv

  1 Oct 06, 20:42

  lazy people who dont wanna think