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Consider a triangle PQR with P-= (0, 0),...

Consider a triangle `PQR` with `P-= (0, 0), Q-= (a, 0), R -=(0, b)`. Then the centroid, orthocentre and circumcentre (A) lies on a straight line (B) form a scalene triangle with area `a/2 |ab|` (C) form a right-angled triangle with area `1/2 |ab|` (D) none of these

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