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

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.

Scroll to see replies

Reply 1
Avatar for M_E_X
M_E_X
14
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 :smile:

For my contribution:
The so called "The Hardest Logic Puzzle in the World"
http://xkcd.com/blue_eyes.html
No cheating!!
Reply 2
Avatar for neomilan
neomilan
OP
17
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!
Reply 3
Avatar for AAAirz
AAAirz
11
1. 45
2. 5 tails in a row
1. is not 45 surely? the general nomenclature for this type of q is n(n-1) so 10*(10-1) = 90
Reply 5
Avatar for AAAirz
AAAirz
11
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
Reply 6
Avatar for BJack
BJack
19
You need to factor in the chance that the cyanide will pass through your system without killing you!
Reply 7
Avatar for Gesar
Gesar
1
Nope^, correct. answer is 0.5*9*(9-1)=36.
Reply 8
Avatar for AAAirz
AAAirz
11
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
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...
Reply 10
Avatar for BJack
BJack
19
Gesar
Nope^, correct. answer is 0.5*9*(9-1)=36.


Ten people. :s-smilie:
Reply 11
Avatar for AAAirz
AAAirz
11
http://au.answers.yahoo.com/question/index?qid=20080715010029AAnUTEB

i was right after all
Reply 12
Avatar for silver_j
silver_j
Gesar
Nope^, correct. answer is 0.5*9*(9-1)=36.

How? Surely it's 45...
assuming handshakes are not iterated
yeah but whats the general formula?
Reply 15
Avatar for alex-hs
alex-hs
16
if 10 people shake hands, there are 5 handshakes!
would 0.5*n(n-1) work for n people?
Reply 17
Avatar for AAAirz
AAAirz
11
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)
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.
Reply 19
Avatar for AAAirz
AAAirz
11
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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