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In a plane, there are 37 straight lines, of which 13 pass through the point A and 11 pass through the point B, besides no three lines pass through one point, no line passes through both points A and B no two lines are parallel. Find the number of points of intersection of the straight lines. |
| Answer» In a plane, there are 37 straight lines, of which 13 pass through the point A and 11 pass through the point B, besides no three lines pass through one point, no line passes through both points A and B no two lines are parallel. Find the number of points of intersection of the straight lines. | |