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There are 10 married couples at a party. At the start of the party, every person shakes hands once with every other person except his or her spouse. How many handshakes are there?

 Sep 28, 2020
 #1
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20 people have to shake hands with 18 other folks

  20 x 18 = 360     but each handshake involves TWO people, so divide by 2   360/2 = 180 handshakes

 Sep 28, 2020
 #2
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All twenty of them shake hands with 18 people.      20 * 18 = a lot of handshakes smiley

 Sep 28, 2020

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