There are 5 people in a room. If each person shakes hands with every other person exactly once, how many handshakes occur?
Q1. There are 5 people in a room. If each person shakes hands with every other person exactly once, how many handshakes occur?
Answer: 10
Explanation: The formula to calculate handshakes among 'n' people is n(n-1)/2. For n = 5, we have 5(5-1)/2 = 10.