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If P= (1,0);Q=(-1,0) & R= (2,0) are thre...

If `P= (1,0);Q=(-1,0) & R= (2,0)` are three given points, then the locus of the points S satisfying the relation, `SQ^2 + SR^2 =2SP^2` is - (a)a straight line parallel to x-axis (b) A circle through origin (c) A circle with center at the origin (d)a straight line parallel to y-axis

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