Let $n$ blue lines, no two of which are parallel and no three concurrent, be drawn on a plane. An intersection of two blue lines is called a blue point. Through any two blue points that have not already been joined by a blue line, a red line is drawn. An intersection of two red lines is called a red point, and an intersection of red line and a blue line is called a purple point. What is the maximum possible number of purple points?
1. **Determine the number of blue points:**
   Since there are \( n \) blue lines, and no two are parallel and no three are concurrent, each pair of blue lines intersects exactly once. Therefore, the number of blue points is given by the combination formula:
   \[
   \binom{n}{2} = \frac{n(n-1)}{2}
   \]

2. **Determine the number of red lines:**
   A red line is drawn through any two blue points that are not already joined by a blue line. The number of ways to choose two blue points from the total number of blue points is:
   \[
   \binom{\binom{n}{2}}{2} = \binom{\frac{n(n-1)}{2}}{2}
   \]
   Simplifying this, we get:
   \[
   \binom{\frac{n(n-1)}{2}}{2} = \frac{\left(\frac{n(n-1)}{2}\right)\left(\frac{n(n-1)}{2} - 1\right)}{2} = \frac{\frac{n(n-1)}{2} \cdot \frac{n(n-1) - 2}{2}}{2} = \frac{n(n-1)(n(n-1) - 2)}{8}
   \]

3. **Determine the number of purple points:**
   Each red line intersects each blue line at most once, and each red line intersects at least four blue lines at blue points. Therefore, each red line intersects at most \( n-4 \) blue lines at purple points. The total number of purple points is then:
   \[
   \left(\frac{n(n-1)(n(n-1) - 2)}{8}\right) \cdot (n-4)
   \]
   Simplifying this, we get:
   \[
   \frac{n(n-1)(n(n-1) - 2)(n-4)}{8}
   \]

4. **Correct the formula:**
   The correct formula for the number of red lines is actually:
   \[
   \binom{\frac{n(n-1)}{2}}{2} = \frac{\left(\frac{n(n-1)}{2}\right)\left(\frac{n(n-1)}{2} - 1\right)}{2}
   \]
   Simplifying this, we get:
   \[
   \frac{\frac{n(n-1)}{2} \cdot \left(\frac{n(n-1)}{2} - 1\right)}{2} = \frac{n(n-1)}{2} \cdot \frac{n(n-1) - 2}{2} = \frac{n(n-1)(n(n-1) - 2)}{8}
   \]

5. **Final calculation:**
   The maximum possible number of purple points is:
   \[
   \frac{n(n-1)(n-2)(n-3)(n-4)}{8}
   \]

The final answer is \(\boxed{\frac{n(n-1)(n-2)(n-3)(n-4)}{8}}\)