Respuesta :
The first person will shake the hand whit the other 11 people, the second with 10 because he has already shook his hand with the first, and so on.
So there will be 11+10+9+8+7+6+5+4+3+2+1=66 handshakes.
Hope this helped!
So there will be 11+10+9+8+7+6+5+4+3+2+1=66 handshakes.
Hope this helped!