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The cone, hemisphere and cylinder stand on equal bases which means their base radius is same

Let that base radius be r

It is given that height = r

Volume of cone = πr²h = πr³

Volume of hemisphere = πr³

Volume of cylinder = πr²h =πr³

Ratio of cone to hemisphere = =

Ratio of hemisphere to cylinder = =

⇒ ratio of volumes of all three solid = 1:2:3