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Khan academy’s probability course: https://www.youtube.com/watch?v=boH4l1SgJbM
6. The number shake hands that we get for a single person where n = 3 is 2 i.e n-1. SO we multiply with the number of members with n-1 = n*(n-1). where as the to avoid double hand shakes we divide by 2. n*(n-1)/2 = 3(3-1)/2 = 3*2/2=3
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