The ratio of the surface area of a sphere and the curved surface area of the cylinder circum scribing the sphere is

The ratio of the surface area of a sphere and the curved surface area of the cylinder circum scribing the sphere is
1). 1:2
2). 1:1
3). 2:1
4). 2:3

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1. The total surface area of a right circular cylinder is 23100 cm2 and its volume is _______ cm3. The ratio of curved surface area of the cylinder to the total area of its two bases is 2 : 1.

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