**Any 2 points determine a line. if there are 6 points in a plane, no 3 of which lie on the same line, how many lines are determined by pairs of these 6 points?**

**Answer:**

**Any 2 points determine a line. if there are 6 points in a plane, no 3 of which lie on the same line, how many lines are determined by pairs of these 6 points?**

**Answer:**