In a room of 6 people, how many different handshakes are possible if each person shakes hands once with every other?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 15.
Person 1 shakes hands with 5 people, person 2 with 4 new people, and so on;
5 + 4 + 3 + 2 + 1 = 15