Question

12 members are participating at a conference . they all shook hands with each other both before and after the meeting. how many handshakes were there

Answer 1

total 132 handshakes

Step-by-step explanation:

before conference they shakes hands

= 12+11+10+9+8+7+6+5+4+3+2+1 =66

and after conference they shake hands

=12+11+10+9+8+7+6+5+4+3+2+1 =66

all handshakes

= 66+66

132

hope it will help you