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24 February, 07:55

In a group of 19 people each must shake hands with the others how many handshakes

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  1. 24 February, 10:57
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    It's 18 + 17 + 16 ... + 1.

    This is because each person shakes hands with 18 other people, but then they have already shaken hands with a certain amount of people, and that number goes up by one every single time.

    The sum of that is 171.

    So 171 handshakes occur.
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