Question

there are 30 students in a class and the teacher said them to take handshakes so how many hand shake will happen in this class​

Answer 1

Answer:

Step-by-step explanation:

the first boy will make: 29 handshakes

2nd boy: 28

3rd boy: 27 and so on

so total handshakes: 29+28+27........1

                                  sum of n natural numbers from 1 to n: n(n+1)(2n+1)/6

answer: 29(30)(59)/6 : 5900