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30 December, 01:18

If eight people greet each other at a meeting by shaking hands with one another, how many handshakes take place?

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  1. 30 December, 03:40
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    The formula is n (n-1) / 2, for 8 people this is 8*7/2 = 28.

    8 persons each have 7 people to shake hands with, but then you have counted each handshake twice (from the perspective of both participants), so you have to divide by 2.
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