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
 

Muktombu

Member Since 04 Nov 2013
Offline Last Active Nov 04 2013 07:55 PM
-----

Topics I've Started

Guess 1 out of 100 numbers

04 November 2013 - 07:56 PM

Hello all,

I have come across an incredibly difficult riddle which I would like to share with you:

 

100 people are assigned with natural numbers between 1 and 100. These numbers are entirely random and independent of one another, meaning there can be duplicates (and consequently missing numbers). Each person receives an anonymous list of 99 numbers representing everyone else's numbers but not her own.

She then makes a guess regarding her own number based on the numbers she sees and the strategy that was agreed upon in advance by the group. They cannot communicate in any way and cannot hear what others have guessed, i.e. they are completely isolated all the way through.

The strategy they develop should guarantee that at least 1 person makes a correct guess regardless of the given numbers.

 

I have battled through this brain crushing puzzle, and would be glad to see your ideas and thoughts.

 

Cheers!

 

Btw, I am sorry if this riddle was already posted, I tried searching before posting.