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If the radius of a sphere is increased by 2 cm, then its surface area increases by 352 cm^2 . The radius of the sphere before the increase was:

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 If the radius of a sphere is increased by 2 cm, then its surface area increases by 352 cm2 . The radius of the sphere before the increase was: 

(a) 3cm (b) 4cm (c) 5cm (d) 6 cm (e) None of these

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4π (r + 2)2 – 4πr2 = 352

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