trunefan4379 trunefan4379
  • 03-09-2017
  • Mathematics
contestada

If 23 people shake each others hands once how many hands are shook in all

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Аноним Аноним
  • 03-09-2017
This is the number of combinations of 2 from 23
 23C2   = 23! / 2! 21!

A quick way to do this   is  23*22 / 2   =   253
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