What is the maximal number of regions a circle can be divided in by segments joining $n$ points on the boundary of the circle ?

[i]Posted already on the board I think...[/i]
1. **Claim:** The maximal number of regions occurs when no three of the chords are concurrent.

2. **Proof:** Let \( l_1 \), \( l_2 \), and \( l_3 \) be three chords that concur at a single point. Then, shift \( l_3 \) by an arbitrarily small margin such that \( l_1, l_2, l_3 \) no longer concur, and the intersections and regions \( l_3 \) creates with all chords other than \( l_1 \) and \( l_2 \) are not affected. In this manner, the number of regions by having these chords not concur increases (by 1), since through this shifting, a new region determined by \( l_1 \), \( l_2 \), and \( l_3 \) is created. Applying this logic to every set of 3 or more chords yields the desired result. 

3. Now, treat the optimal configuration as a graph. We first compute the number of vertices. Observe that there is a bijection between chord intersection points inside the circle and sets of 4 points on the circumference, because each such intersection point is the intersection of the diagonals of a quadrilateral with its vertices on the circumference, and vice versa. As a result, there are \( \binom{n}{4} \) intersection points, and combining this with the \( n \) points on the circumference gives \( \binom{n}{4} + n \) vertices in the graph.

4. We then compute the number of edges. There are \( \binom{n}{2} \) chords connecting the \( n \) points on the circumference, and each of the \( \binom{n}{4} \) interior intersection points creates 2 additional edges, because it splits each of the 2 edges it lies on into 2 smaller edges. As a result, there are \( 2 \binom{n}{4} + \binom{n}{2} \) edges inside the circle, and combining this with the \( n \) arcs forming the circumference yields \( 2 \binom{n}{4} + \binom{n}{2} + n \) edges in the graph.

5. Hence, by Euler's characteristic, 
\[
F = E - V + 2 = \left(2 \binom{n}{4} + \binom{n}{2} + n\right) - \left(\binom{n}{4} + n\right) + 2 = \binom{n}{4} + \binom{n}{2} + 2,
\]
and subtracting the 1 region outside of the circle gives 
\[
\boxed{\binom{n}{4} + \binom{n}{2} + 1}
\]
regions inside the circle, as requested.