A group of 20 students are sitting in a circle. Each shakes hands with exactly 3 neighbors. How many handshakes occur?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 30.
Each of 20 students shakes hands with 3 people → total count = 20 × 3 = 60
Each handshake is counted twice (A with B and B with A), so divide by 2 = 60 ÷ 2 = 30