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Q: If 2000 people shake hands once with everyone in the room how many hand shakes would take place?
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First person shakes hands 19 times, second person 18 etc, a total of 190.


If seven people are in a room and they shake hands with each other once how many hand shakes would take place?

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Actually, that is incorrect. Not everyone would shake hands 27 times with another person, otherwise there would be people shaking hands more than once. I'm not entirely sure of the rule for this but this will help. 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 28 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 0 Now the problem does not fully solve that but it explains some things the last person shakes hands with no one because everyone shakes his hand. the first person shakes hands with everyone except himself. So what you do is you add up how many handshakes each person makes. you come to 378. Noone here knows math That works, but it's a lot easier to just use this function: number of handshakes = 0.5*(X2-X) Where X is the number of people. It's a lot easier, and less time consuming.


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