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The thickness of a cylinder is 1 foot, t...

The thickness of a cylinder is 1 foot, the inner radius of the cylinder is 3 feet and height is 7 feet. To paint the inner suface it requires one litre of a particular colour . How much quantity of the same colour is required to paint all the surfaces of the cylinder?

A

`( 7 )/( 3) `litre

B

`( 3)/( 2)` litre

C

`( 8 )/( 3) ` litre

D

`( 10)/( 3) ` litre

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