If the radius if a sphere is 2r, then its volume will be
Given, the radius of a sphere is 2r.
The volume of a sphere
Thus, the volume of the given sphere = 
Thus, option d is correct.
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If the radius if a sphere is 2r, then its volume will be
Given, the radius of a sphere is 2r.
The volume of a sphere
Thus, the volume of the given sphere =
Thus, option d is correct.