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
- - - - -

Who am I?


Best Answer nakulendu, 06 March 2013 - 03:33 PM

Spoiler for Reasonable Lie Detection

 

Spoiler for Adding a spoiler

Go to the full post


  • Please log in to reply
10 replies to this topic

#1 BMAD

BMAD

    Senior Member

  • Members
  • PipPipPipPip
  • 1660 posts
  • Gender:Female

Posted 06 March 2013 - 04:04 AM

We are taking one statement from each of eight people. The last two are Bill and Susan, or maybe Susan and Bill. Anyway, one of those two is Susan, the other is Bill. See if you can deduce which is Bill and which is Susan:

  1. Exactly seven of us are lying.
  2. Exactly six of us are lying.
  3. Exactly five of us are lying.
  4. Yes, exactly five of us are lying.
  5. Exactly four of us are lying.
  6. Exactly three of us are lying.
  7. My name is Susan.
  8. My name is Bill.

  • 0

#2 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 428 posts
  • Gender:Male

Posted 06 March 2013 - 04:34 AM

Spoiler for Easy


  • 0

#3 nakulendu

nakulendu

    Junior Member

  • Members
  • PipPip
  • 29 posts

Posted 06 March 2013 - 05:46 AM

Spoiler for Reasonable Lie Detection


Edited by nakulendu, 06 March 2013 - 05:47 AM.

  • 0

#4 witzar

witzar

    Advanced Member

  • Members
  • PipPipPip
  • 194 posts

Posted 06 March 2013 - 03:04 PM

Spoiler for

Edited by witzar, 06 March 2013 - 03:04 PM.

  • 0

#5 nakulendu

nakulendu

    Junior Member

  • Members
  • PipPip
  • 29 posts

Posted 06 March 2013 - 03:33 PM   Best Answer

Spoiler for Reasonable Lie Detection

 

Spoiler for Adding a spoiler


Edited by bonanova, 25 March 2013 - 02:21 PM.
Added a spoiler for the answer

  • 0

#6 bhramarraj

bhramarraj

    Advanced Member

  • Members
  • PipPipPip
  • 254 posts

Posted 25 March 2013 - 10:41 AM

Spoiler for


  • 0

#7 dark_magician_92

dark_magician_92

    Advanced Member

  • Members
  • PipPipPip
  • 382 posts

Posted 25 March 2013 - 04:54 PM

2 possiblities giving same answer

Spoiler for


  • 0

#8 bhramarraj

bhramarraj

    Advanced Member

  • Members
  • PipPipPip
  • 254 posts

Posted 08 April 2013 - 05:11 PM

2 possiblities giving same answer

Spoiler for

[acronym='']All can't lie, because Statement 1 becomes true as soon as seven are considered lie. It is really amazing isn't it...?[/acronym]


  • 0

#9 dark_magician_92

dark_magician_92

    Advanced Member

  • Members
  • PipPipPip
  • 382 posts

Posted 09 April 2013 - 04:59 PM

2 possiblities giving same answer

Spoiler for

[acronym='']All can't lie, because Statement 1 becomes true as soon as seven are considered lie. It is really amazing isn't it...?[/acronym]

But there are 8 people. If all of them lie, then statement 1 is false.


  • 0

#10 bhramarraj

bhramarraj

    Advanced Member

  • Members
  • PipPipPip
  • 254 posts

Posted 10 April 2013 - 07:42 AM

 

2 possiblities giving same answer

Spoiler for

[acronym='']All can't lie, because Statement 1 becomes true as soon as seven are considered lie. It is really amazing isn't it...?[/acronym]

But there are 8 people. If all of them lie, then statement 1 is false.

Please think again. There are 8 statements given in OP. If first statement is also considered to be a lie then there will be 8 false statements, but we can not make forced opinion. We have to go by statements available with us.

More clearly to say is that even if first person wanted to lie, he could not lie by giving this statement.


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users