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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 line || to X-axis

B

a line || to Y-axis

C

circle with centre at origin

D

none of these

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The correct Answer is:
B
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