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A sphere of constant radius k passes thr...

A sphere of constant radius k passes through the origin and meets the coordinate axes at `P`,`Q`,`R`. Prove that centroid of the triangle `PQR` lies on the sphere `9(x^(2)+y^(2)+z^(2)) = 4k^(2)`.

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MODERN PUBLICATION-SAMPLE PAPER 2015-EXERCISE
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