A right circular cone, a right circular cylinder and a hemisphere, all have the same radius, and the heights of the cone and cylinder equal to their diameters. Then their volumes are proportional, respectively to
Explanation:
If the diameters and the heights of a cone and a cylinder are same, then the volume of cone is always 1/3rd the volume of the cylinder. So the ratio of the volume of cone to the volume of cylinder = 1 : 3. The only answer choice that supports this is (a).
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