If you have 5 people in a room and each person shakes hands with every other person once, how many total handshakes happen
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Step-by-step explanation:
second pattern that may be described is that each person has to shake hands with all the others. If there are 6 people each person has 5 handshakes to make. But each time a handshake occurs there are 2 people involved. This means that you only need ½ (6 x 5 ) = 15.
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