Results are out! Find what you need...fast. Get quick advice or join the chat
Hey there Sign in to join this conversationNew here? Join for free

Logic - IQ - Trick Questions - Mind games - Intelligent thinking - Questions Wanted!

Announcements Posted on
    • Thread Starter
    • 1 follower
    Offline

    ReputationRep:
    Has anyone got questions that require some abstract thinking, sort of like IQ test or mind games etc.

    here are some examples of what im looking for:

    1. at the end of a dinner, 10 people shake hands with each other, how many handshakes in total?
    or like this:

    2. Which scenario gives you the best chance of survival?
    -Flip 5 tails in a row or get your head cut off
    -Roll snake eyes or eat cyanide for dinner
    -Roll a 7 twice in a row or be drawn and quartered
    -Get dealt 2 aces (standard 52 card deck; 2 cards dealt) or jump from the top of the Empire State Building

    etc.
    • 3 followers
    Offline

    ReputationRep:
    1. 90
    2. The 5 tails in a row has 1/32 chance, the dice related options have 1/36 chance, and the cards has an almost nothing chance. So...I'd take the dice

    For my contribution:
    The so called "The Hardest Logic Puzzle in the World"
    http://xkcd.com/blue_eyes.html
    No cheating!!
    • Thread Starter
    • 1 follower
    Offline

    ReputationRep:
    (Original post by M_E_X)
    1. 90
    that is wrong by the way

    oh and your contribution is too hard!!! it should be very logic based and to trick someone!
    • 0 followers
    Offline

    ReputationRep:
    1. 45
    2. 5 tails in a row
    • 0 followers
    Offline

    ReputationRep:
    1. is not 45 surely? the general nomenclature for this type of q is n(n-1) so 10*(10-1) = 90
    • 0 followers
    Offline

    ReputationRep:
    Person A can shake hands with 9 people
    Person B can shake hands with 8 people since hes already shaken As hand.
    Person C can shake hands with 7 people etc etc

    I think any way, probs wrong though
    • 8 followers
    Offline

    ReputationRep:
    You need to factor in the chance that the cyanide will pass through your system without killing you!
    • 1 follower
    Offline

    ReputationRep:
    Nope^, correct. answer is 0.5*9*(9-1)=36.
    • 0 followers
    Offline

    ReputationRep:
    (Original post by sammykumar1986)
    Yeah that is wrong

    Person's 1-10 can all shake hands with 9 people. The others don't just vanish! You just cannot shake hands with yourself.

    It's n(n-1) for questions like this.
    yeah but there will be handshakes that are completed twice
    • 0 followers
    Offline

    ReputationRep:
    (Original post by Gesar)
    Nope^, correct. answer is 0.5*9*(9-1)=36.

    Ahh indeed, what is the general formula, everyone shakes hands with another once, minus oneself which one does not...
    • 8 followers
    Offline

    ReputationRep:
    (Original post by Gesar)
    Nope^, correct. answer is 0.5*9*(9-1)=36.
    Ten people.
    • 0 followers
    Offline

    ReputationRep:
    http://au.answers.yahoo.com/question...5010029AAnUTEB

    i was right after all
    • 1 follower
    Offline

    ReputationRep:
    (Original post by Gesar)
    Nope^, correct. answer is 0.5*9*(9-1)=36.
    How? Surely it's 45...
    • 0 followers
    Offline

    ReputationRep:
    assuming handshakes are not iterated
    • 0 followers
    Offline

    ReputationRep:
    yeah but whats the general formula?
    • 0 followers
    Offline

    ReputationRep:
    if 10 people shake hands, there are 5 handshakes!
    • 0 followers
    Offline

    ReputationRep:
    would 0.5*n(n-1) work for n people?
    • 0 followers
    Offline

    ReputationRep:
    (Original post by sammykumar1986)
    yeah but whats the general formula?
    this is an intelligent thinking thread, not just simply remembering a formula.

    but yeah its 0.5n(n-1)
    • 0 followers
    Offline

    ReputationRep:
    (Original post by M_E_X)
    For my contribution:
    The so called "The Hardest Logic Puzzle in the World"
    http://xkcd.com/blue_eyes.html
    No cheating!!
    That is bloody awesome. The solution is so clever.
    • 0 followers
    Offline

    ReputationRep:
    (Original post by alex-hs)
    if 10 people shake hands, there are 5 handshakes!
    what if they all held hands in a circle there would be 10 handshakes

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: February 27, 2010
New on TSR

Strictly iPlayer

Will you still watch if some BBC programmes go online only?

Article updates
Useful resources
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.