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A right circular cone is divided into...

A right circular cone is divided into two portions by a plane parallel to the base and passing through a point which is `1/3r d` of the height from the top. The ratio of the volume of the smaller cone to that of the remaining frustum of the cone is (a) 1 : 3 (b) 1 : 9 (c) 1 : 26 (d) 1 : 27

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