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=(8(8-1))/2
=28
=28
If you number them #1 through #8 just to help identify them, then will be something like this
#8 - 7 hand shakes
...
#3 - 2 hand shakes (he doesn't need to reshake all the other's hands and #2 & #1 are the only ones he has not
#2 - 1 hand shake (he only had #1 left that he has not shaken hands with)
7+6+5+4+3+2+1 = 29
