When there are $9$ points on the circle, how many different triangles can be formed by connecting three points? A. $84$A. $84$ B. $168$ C. $504$ D. $729$ E. $252$
1. Because $3$ points must be chosen out of $9$ points on the circle and order does not matter, $\cfrac{{9}\times{8}\times{7}}{3\times{2}\times{1}}=84$ triangles can be formed. No More Steps
