1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Brain Teaser #5

  1. Jul 4, 2003 #1
    I guess I dont have access to the brain teaser forum. This one kinda confused me:

    Using “Only Four” ZEROS (0) and any Mathematical Operations/Symbols, to obtain the number 24.

    Answer is (0! + 0! + 0! + 0!)! = 24


    I know im a bit rusty with hex/binary arithmatic but the answer i get with (0! + 0! + 0! + 0!)! is 3 assuming 8 bits:

    0! = 0xFF and assuming no carry over:

    0xFF + 0xFF = 0xFE

    so (0xFF + 0xFF + 0xFF + 0xFF) = 0xFC

    !0xFC = 3 Right? Where did I go wrong?
     
    Last edited by a moderator: Jul 4, 2003
  2. jcsd
  3. Jul 4, 2003 #2

    drag

    User Avatar
    Science Advisor

    Yeah... I was wondering about the same thing.
    0! is a factorial, just like n! for example with n
    being any natural number. However 0! = 1.

    Live long and prosper.
     
  4. Jul 4, 2003 #3
    LOL you beat me to it, just got schooled from my wife of all people!

    She said !0 would be 0xFF, but 0! = 1.

    Factorial notation comes AFTER the value.

    and 4! = 24.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Brain Teaser #5
  1. Brain Teaser #4? (Replies: 3)

  2. Brain (Replies: 2)

  3. Brain teaser question (Replies: 10)

Loading...