Question

40 child handshake with each other then how many handshakes

Answer 1

Answer:

There are 40 children.

Every children shakes hands with 39 children

so at first sight there are 40×39=156 handshakes. So 156 is the result of double counting. There are 78 handshakes.

Answer 2

Answer:

there is a formula to determine no. of handshakes

formula is n(n-1)/2 [where 'n' is no of person]

using the formula, we get

40*39/2=780 handshakes

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Step-by-step explanation: