A surface area of a sphere has three times the surface area of a cube. Then, the ratio of the volume of sphere to that of the cube is 

A surface area of a sphere has three times the surface area of a cube. Then, the ratio of the volume of sphere to that of the cube is 

1). 9 : √π
2). 18 : √π
3). 9 : √2π
4). 18 : √2π

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