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504 cones, each of diameter 3.5 cm and height 3 cm are melted and recast into a metallic sphere.find the diameter

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504 cones, each of diameter 3.5 cm and height 3 cm are melted and recast into a metallic sphere.find the diameter of the sphere and hence find its surface area. [ use π = 22/7] 

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= Volume of 504 cones

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