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

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    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.
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    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!!
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    (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!
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    1. 45
    2. 5 tails in a row
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    1. is not 45 surely? the general nomenclature for this type of q is n(n-1) so 10*(10-1) = 90
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    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
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    You need to factor in the chance that the cyanide will pass through your system without killing you!
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    Nope^, correct. answer is 0.5*9*(9-1)=36.
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    (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
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    (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...
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    (Original post by Gesar)
    Nope^, correct. answer is 0.5*9*(9-1)=36.
    Ten people.
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    http://au.answers.yahoo.com/question...5010029AAnUTEB

    i was right after all
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    (Original post by Gesar)
    Nope^, correct. answer is 0.5*9*(9-1)=36.
    How? Surely it's 45...
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    assuming handshakes are not iterated
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    yeah but whats the general formula?
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    if 10 people shake hands, there are 5 handshakes!
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    would 0.5*n(n-1) work for n people?
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    (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)
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    (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.
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    (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

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Updated: February 27, 2010
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