Question

Suppose you mark n points on a circle, where n is a whole number greater than 1. The number of segments you can draw that connect these points is 1/2n2- 1/2n How many segments can you draw if you mark 8 points on the circle

Answer 1

if the equation is 0.5*n*2-0.5n which I doubt:
n-0.5n
8-0.5*8
8-4
the answer would be 4
however if it's 0.5n^2-0.5n:
0.5(8^2)-0.5(8)
0.5(64)-4
32-4
28
then the answer should be 28