If a cone, a hemisphere and a cylinder have equal bases and have same height, then the ratio of their volumes is 1. 1 : 3 : 2 2. 2 : 3 : 1 3. 2 : 1 : 3 4. 1 : 2 : 3

Let the common radius of shapes be r and height be h. Ratio in their volumes = Volume of cone : Volume of hemisphere : Volume of cylinder. On multiplying by 3, ratio = 1 : 2 : 3. Hence, Option 4 is the correct option.