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

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. 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.
2. 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!!
3. (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!
4. 1. 45
2. 5 tails in a row
5. 1. is not 45 surely? the general nomenclature for this type of q is n(n-1) so 10*(10-1) = 90
6. 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
7. You need to factor in the chance that the cyanide will pass through your system without killing you!
8. Nope^, correct. answer is 0.5*9*(9-1)=36.
9. (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
10. (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...
11. (Original post by Gesar)
Nope^, correct. answer is 0.5*9*(9-1)=36.
Ten people.

i was right after all
13. (Original post by Gesar)
Nope^, correct. answer is 0.5*9*(9-1)=36.
How? Surely it's 45...
14. assuming handshakes are not iterated
15. yeah but whats the general formula?
16. if 10 people shake hands, there are 5 handshakes!
17. would 0.5*n(n-1) work for n people?
18. (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)
19. (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.
20. (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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