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    Handshakes

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    On the first day of math class, 20 people are present in the room. To become acquainted with one another, each person shakes hands just once with everyone else. How many handshakes take place?

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    https://brainmass.com/math/discrete-structures/handshakes-40072

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    On the first day of math class, 20 people are present in the room. To become acquainted with one another, each person shakes ...

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