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Let R be the focus of the parabola y 2 = 20x and the line y = mx + c intersect the parabola at two points P and Q. Let the points G(10, 10) be the centroid of the triangle PQR. If c – m = 6, then (PQ) 2 is

1. 296
2. 325
3. 317
4. 346

Correct answer: 325

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