A solid cylinder has total surface area of 462 sq.cm. Its curved surface area is $\frac{1}{3}$ rd of the total surface area.Then the radius of the cylinder is

A solid cylinder has total surface area of 462 sq.cm. Its curved surface area is $\frac{1}{3}$ rd of the total surface area.Then the radius of the cylinder is
1). 7 cm
2). 3.5 cm
3). 9 cm
4). 11 cm

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