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If A(-1, 0), B(1, 0) and C(3, 0) are thr...

If `A(-1, 0), B(1, 0) and C(3, 0)` are three given points, then the locus of point `D` satisfying the relation `DA^2 + DB^2 = 2DC^2` is (A) a straight line parallel to x-axis (B) a striaght line parallel to y-axis (C) a circle (D) none of these

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