Problem
COM-B1-M03-P018 Triangles from Points
#18
★★★☆☆ Level 3 of 5
There are \(9\) marked points on a circle. How many triangles with vertices among these points can be formed?
Any three points on a circle form a triangle.
Choose \(3\) vertices from \(9\). Answer: \(\binom{9}{3}=84\).
Geometric interpretation of combinations.