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8. In a plane there are 27 straight lines, of which 13 pass through the point A and 11 pass through point B. Bedsides, no three lines pass through points A and B and no two are parallel. Find the number of points of intersection of the straight lines. |
| Answer» 8. In a plane there are 27 straight lines, of which 13 pass through the point A and 11 pass through point B. Bedsides, no three lines pass through points A and B and no two are parallel. Find the number of points of intersection of the straight lines. | |