Question

I really need help with this problem

Answer 1

using the formula n(n-1)/2

we can see,

let n be 7

so,

7(7-1)/2

solving the bracket

7(6)/2

42/2

there will be 21 handshakes

what we did is multiply 7 by 7 - 1 which means 6 and then divided it by 2 so then we get the answer which is 21

for finding these type of questions we have to use the formula and multiplied by n(n-1)/2