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The diameters of the ends of a frustum...

The diameters of the ends of a frustum of a cone are 32 cm and 20 cm. If its slant height is 10 cm, then its lateral surface area is
(a)`321pic m^2`
(b) `300pic m^2`
(c) `260pic m^2`
(d) `250pic m^2`

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