Math Riddles

Originally posted by XanthosNZ
You attend a party along with N other people. Given any group of 4 party-goers you can be sure that at least one of the 4 knows the other three. Prove that at least one person knows all others at the party.

Does "A knows B" imply "B knows A" ?

Originally posted by ThudanBlunder
That'll teach you to ask for maths riddles. 😛

So?

Originally posted by chess kid1
So?

Dear Friend,
The posters on this site, in this thread have since your arrival relentlessly beaten you up repeatedly in regards to your posts. Do you really need a more detailed explanation as to what they believe is a proper Puzzle and Poser?

Originally posted by chess kid1
So?

So if a,b,c,d are positive integers such that ab = cd, prove before bedtime that a + b + c + d is never prime.

Originally posted by ThudanBlunder
So if a,b,c,d are positive integers such that ab = cd, prove before bedtime that a + b + c + d is never prime.

Bedtime in what time zone?

Originally posted by thespacemonkey
Bedtime in what time zone?

chess kid1's obviously.

Originally posted by ThudanBlunder
chess kid1's obviously.

Of course! How silly of me.

Originally posted by thespacemonkey
Of course! How silly of me.

Sleep is for wimps, spacedmonkey. 😛

Originally posted by ThudanBlunder
Sleep is for wimps, spacedmonkey. 😛

And students...

Originally posted by aging blitzer
Does "A knows B" imply "B knows A" ?

I would say 'Yes', unless of course they are married.

Originally posted by ThudanBlunder
I would say 'Yes', unless of course they are married.

We're not talking 'knowing in a biblical sense'. That would make for an interesting party though.

You attend an orgy along with N other people. Given any group of 4 orgy-goers you can be sure that at least one of the 4 had intercourse with the other three. Prove that at least one person was a complete (man)whore.

EDIT: A total whore is someone who has intercourse with every person (other than themselves) at an orgy. Today you learnt something new.

Originally posted by XanthosNZ
You attend a party along with N other people. Given any group of 4 party-goers you can be sure that at least one of the 4 knows the other three. Prove that at least one person knows all others at the party.

EDIT: I have saved this thread.

I am alerting the moderators that you used the N.

Originally posted by FreakyKBH
I am alerting the moderators that you used the [b]N.[/b]

!!!!???? What's wrong with that?

Originally posted by chess kid1
!!!!???? What's wrong with that?

N is just a plain ol' variable.

Originally posted by chess kid1
N is just a plain ol' variable.

By the way, how come your rating has dropped so much in the last month?