Question

12 members were present at a board meeting. Each member shook hands with all of the other members before and after the meeting. How many handshakes were there?

Answer 1

think of it this way: The 1st person sakes with 11 members. people the 2nd person also shakes with 11members. but you only count 10, because the hand shake with the first person was already counted,. then add 9 for the third person, 8 for the the fourth person, so on 66 hand shake took place before, 66 after meeting, for

a total of 132.