If each person is shaking with only one hand, then the answer is seven. If they are shaking with both hands, then the answer is 14.
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36. Everybody shakes 8 hands but each shake counts for 2 people. So 9*8/2=36.
20 hand shakes would take place. Here's how: 1234567 23456 34567 4567 567 67 7 And a person can't shake his own hand or someones hands twice
45 handshakes
4950
210