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Two cones have their heights in the ratio 1:3 and the radii of their bases in the ratio 3:1. Find the ratio of their volumes.

3:1
2:1
4:1
5:1

Correct Answer: 3:1

Explanation:

$\frac{v 1}{v 2} = \frac{r 12 H}{r 22 H}$

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