At a conference, 12 members shook hands with each other before & after the meeting. How many total number of handshakes occurred?
Correct
Incorrect
Person #1 can shake hands with 11 people (#2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12) Person #2 can shake hands with 10 (they can’t shake hands with #1, as they’ve already done it.) Person #3 can shake hands with 9, etc. So, in the end, we get 132 handshakes in total.