Question

How to calculate 29 30 students handshake with 30 equal how many handshake will be there?

Answer 1

Answer:         The process is a nice, concrete way of showing why that formula makes sense: n people would each shake (n – 1) hands, but that counts every handshake twice, so we have to divide by 2. Thus, n(n – 1)/2. The handshake problem has many variations in presentation