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ABCD is a parallelogram. P, Q and R are the mid-points of AB, AC and BC respectively. If the coordinates of the vertices A, D and C are (l, n) (0, 0) and (m, 0) respectively, then find the sum of the abscissas of points P, Q and R.

Answer» ABCD is a parallelogram. P, Q and R are the mid-points of AB, AC and BC respectively. If the coordinates of the vertices A, D and C are (l, n) (0, 0) and (m, 0) respectively, then find the sum of the abscissas of points P, Q and R.


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