There are 30 people in a group. If all shake hands with one another , how many handshakes are possible?
Q1. There are 30 people in a group. If all shake hands with one another , how many handshakes are possible?
Answer: 435
Explanation: Each handshake involves 2 people chosen from 30. Number of handshakes = C(30,2) = 30×29/2 = 435.