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The total surface area of a hollow metal cylinder, open at both ends of external radius $$8$$ cm and height $$10$$ cm is $$338\pi$$ $$cm^2$$. Taking r to be inner radius, obtain an equation in r and use it to obtain the thickness of the metal in the cylinder.

A
$$3$$ cm.
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Correct option is A. $$3$$ cm.

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