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?? five different answers ??

5 ?

five..

The answer is he shook 2 people's hands.

how?

must be six .. because there are 3 couples .. and this seventh person is an outsider

This is a very old combinatoric puzzle.

@JoshDavoll if the person was insider .. then answer must be 4

the answer is 2

yeah, if he was the insider as you say.

i have a solution, gimme a sec

@FoolForMath is probably correct.

http://www.gottfriedville.net/mathprob/misc-shakes2.html

he asked them after all this happened, i think you misunderstand

number the couples 1 , 2 , 3

so m1 is male from couple 1 , and f1 is female from couple 1

etc etc

Ah i get it now, thanks for explaining it :)

how many hands ON ARRIVING?? i think i understood the question now.