SOLUTION: If 20 people in a class shake hands with each other exactly once, how many handshakes will take place

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Question 656243: If 20 people in a class shake hands with each other exactly once, how many handshakes will take place
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
C(20,2) = 20%2A19%2F%282%2A1%29 = 190