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The height of a cone is 60cm. A small co...

The height of a cone is 60cm. A small cone is cut off at the top by a plane parallel to the base and is volume is `1/(64)t h` the volume of original cone. The height from the base at which the section is made is: (a) 15cm (b) 30cm (c) 45cm (d) 20cm

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