There are 5 people in a room. Each people shook hands with each of the other only once. Find the total number of handshakes took place.
A 5
B 10
C 15
D 20
i can not solve this question .please help
There are 5 people in a room. Each people shook hands with each of the other only once. Find the total number of handshakes took place.
A 5
B 10
C 15
D 20