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If a circle of constant radius 3k passe...

If a circle of constant radius `3k` passes through the origin `O` and meets the coordinate axes at `Aa n dB` , then the locus of the centroud of triangle `O A B` is (a)`x^2+y^2=(2k)^2` (b)`x^2+y^2=(3k)^2` (c)`x^2+y^2=(4k)^2` (d) `x^2+y^2=(6k)^2`

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