SOLUTION: Tom is leading a workshop for 16 people. He wants each person to meet every other person (shake hands once). How many handshakes occur?

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Question 865068: Tom is leading a workshop for 16 people. He wants each person to meet every other person (shake hands once). How many handshakes occur?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a shakes hands with 15 others
b shakes hands with 15 others
c shakes hands with 15 others
16 shake hands with 15 others =240
a with b is the same as b with a
so we have 8*15=120