Question

if there are 10 children in a class how many shake hand will be there.​

Answer 1

Answer:

The class has 8 children The first child shakes hands with the other 7 children The second child has already shaken hands with the first child and so has to shake hands with only the other 6 children In this manner the second last child has to shake hands with only one child and the last child has already met all the children Thus the number of handshakes is 7 + 6 + .+ 2 + 1 = 28 If there were 8 children in the class then there were 28 total handshakes