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(a) Three metallic spherical balls of ra...

(a) Three metallic spherical balls of radii 3 cm , 4cm and 5 cm are melted and reacast in to a big spherical ball find the radius of this big ball.
(b) Three metallic spheres are melted and recast in to a big solid sphere.Find the radius of big solid sphere if the diameter of three metalic sphres are 16 cm . 12 cm and 2 cm.

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