A hollow spherical metallic ball has ...

A hollow spherical metallic ball has an external diameter 6 cm and is `1/2c m` thick. The volume of metal used in the ball is `37 2/3c m^3` (b) `40 2/3c m^3` (c) `41 2/3c m^3` (d) `47 2/3c m^3`

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