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

User Vishnu S Babu
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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
User BakriOnFire
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