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If P-=(1,0), Q-=(-1, 0), R-=(2,0) are th...

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

A

a straight line parallel to the x-axis

B

a circle passing through the origin

C

a circle with centre at origin

D

a straight line parallel to the y-axis

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The correct Answer is:
D
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