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If P(1,0), Q(-1,0) and R (2,0) are three...

If P(1,0), Q(-1,0) and R (2,0) are three given points, then the locus of the point `S` satisfying the relation `(SQ)^2+(SR)^2=2(SP)^2`

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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