Consider $n \geq 2$ distinct points in the plane $A_1,A_2,...,A_n$ . Color the midpoints of the segments determined by each pair of points in red. What is the minimum number of distinct red points?
1. **Identify the problem and the goal**: We need to find the minimum number of distinct midpoints of segments determined by $n \geq 2$ distinct points in the plane.

2. **Consider the case when points are collinear**: 
   - If all $n$ points are collinear and equally spaced, the midpoints of the segments determined by each pair of points will be distinct.
   - For $n$ collinear points, the number of distinct midpoints is $2n-3$. This can be visualized by considering the midpoints of segments formed by the first point with all other points, and the last point with all other points, minus the overlap of the midpoint of the segment between the first and last points.

3. **Generalize the argument**:
   - Let the points be $A_1, A_2, \ldots, A_n$.
   - Assume $A_1A_n \geq A_iA_j$ for all $1 \leq i, j \leq n$.
   - Consider the midpoints of the segments $[A_1, A_i]$ for $2 \leq i \leq n$. These $n-1$ midpoints are distinct and lie within a circle centered at $A_1$ with radius $\frac{1}{2}A_1A_n$.
   - Similarly, consider the midpoints of the segments $[A_j, A_n]$ for $1 \leq j \leq n-1$. These $n-1$ midpoints are distinct and lie within a circle centered at $A_n$ with radius $\frac{1}{2}A_1A_n$.
   - The midpoint of $[A_1, A_n]$ is common to both groups of midpoints.

4. **Calculate the total number of distinct midpoints**:
   - The total number of midpoints is $(n-1) + (n-1) - 1 = 2n-3$.
   - This calculation accounts for the overlap of the midpoint of $[A_1, A_n]$.

5. **Conclusion**:
   - The minimum number of distinct red points (midpoints) is $2n-3$.

The final answer is $\boxed{2n-3}$