Question

I need help pleaseeeeee

Answer 1

using the formula n(n-1)/2

using the formula n(n-1)/2 we can see,

using the formula n(n-1)/2 we can see,let n be 7

using the formula n(n-1)/2 we can see,let n be 7so,

using the formula n(n-1)/2 we can see,let n be 7so,7(7-1)/2

using the formula n(n-1)/2 we can see,let n be 7so,7(7-1)/2solving the bracket

using the formula n(n-1)/2 we can see,let n be 7so,7(7-1)/2solving the bracket7(6)/2

using the formula n(n-1)/2 we can see,let n be 7so,7(7-1)/2solving the bracket7(6)/242/2

using the formula n(n-1)/2 we can see,let n be 7so,7(7-1)/2solving the bracket7(6)/242/2there 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