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A metallic sphere of radius ‘r’ is melte...

A metallic sphere of radius ‘r’ is melted and recast into the shape of solid cylinder of radius ‘r’, the height of the cylinder is

A

3r

B

`3/4r`

C

`4/3r`

D

4r

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  17. The ratio of volume of two cones is 4:5 and the ratio of the radii of ...

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