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If all of the delegates shake hands with one another, how many handshakes are exchanged?

rainbow

New member
Oct 25, 2018
13
at a United Nations meeting, a group of 15 delegates meet to discuss an international peace treaty. If all of the delegates shake hands with one another, how many handshakes are exchanged?
 

Country Boy

Well-known member
MHB Math Helper
Jan 30, 2018
368
That should be straight forward. In a group of n people each person shakes hands with the n-1 other people. That would be a total or n(n-1) except that each had shake involves two people. The total number of hand shakes is n(n-1)/2.