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If a circle of constant radius 3K passes...

If a circle of constant radius 3K passes through the origin and meets the axes at A&B.the locus of the centroid of `triangleOAB` is

A

`x^2+y^2=k^2`

B

`x^2+y^2=2k^2`

C

`x^2+y^2=3k^2`

D

none of these

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