Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

Probability in Pi


Best Answer plasmid, 21 May 2014 - 06:43 AM

I think this argument should hold water.

Spoiler for

Go to the full post


  • Please log in to reply
8 replies to this topic

#1 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 435 posts
  • Gender:Male

Posted 15 May 2014 - 05:30 PM

It is a well-known fact that the number pi is an irrational number. This means that its decimal representation is infinitely long.

 

3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664...

 

What is the probability that pi's decimal representation contains a sequence of digits ...0123456789....?

What is the probability that it contains ...33333333333333333333...?


  • 0

#2 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5718 posts
  • Gender:Male
  • Location:New York

Posted 16 May 2014 - 08:53 AM

Spoiler for first thoughts


  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#3 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 435 posts
  • Gender:Male

Posted 20 May 2014 - 03:01 PM

Any other thoughts?

 

Spoiler for Conjecture


  • 0

#4 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5718 posts
  • Gender:Male
  • Location:New York

Posted 20 May 2014 - 04:20 PM

Spoiler for Isnt that


  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#5 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 435 posts
  • Gender:Male

Posted 20 May 2014 - 04:31 PM

Maybe it is. I don't know as I've never heard of it before


  • 0

#6 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5718 posts
  • Gender:Male
  • Location:New York

Posted 20 May 2014 - 04:41 PM

I don't know that it applies, although it sounds related. As I recall hearing it, it holds that a system will visit every available state given enough time. A weaker "quasi" ergodic theorem says that a system will visit a finite region around every available state (implying there is a distance function of some type) given enough time.

 

The resolution of your conjecture may not be covered by either of these.

 

The resolution may rest on certain conditions being satisfied. It's a zero-times-infinity puzzle that might require either a strong intuition or great mathematical skill to answer. I have some intuition, but it's often wrong. That fact keeps me coming back to this site. ^_^

 

So I wonder whether the decimal expansion for e can occur within the expansion for pi. 


  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#7 plasmid

plasmid

    Senior Lolcat

  • VIP
  • PipPipPipPip
  • 1371 posts
  • Gender:Male

Posted 21 May 2014 - 06:43 AM   Best Answer

I think this argument should hold water.

Spoiler for


  • 0

#8 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5718 posts
  • Gender:Male
  • Location:New York

Posted 21 May 2014 - 07:14 AM

I think this argument should hold water.

Spoiler for

 

Agree.


  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#9 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 435 posts
  • Gender:Male

Posted 21 May 2014 - 05:02 PM

Nice explanation, plasmid. Marking as solved.


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users