Question
Two cones have their height in the ratio of 1 : 3 and radii 3 : 1 . The ratio of their volumes is :
Answer: Option C
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Let their height be `x , 3x` and their radii 3y, y.
Then ,Ratio of volumes = `(1/3 xx pi xx (3y)^2 xx x)/(1/3 xx pi xx y^2 xx (3x))`
= `9/3 = 3/1` = 3 : 1.
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