Ratio of volumes of two cones or cylinders from ratios of radii and heights

1. A.
   $1 : 1$
2. B.
   $2 : 1$
3. C.
   $3 : 1$
4. D.
   $9 : 1$

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1. A.
   $\sqrt{3} : 1$
2. B.
   $\sqrt{3} : \sqrt{2}$
3. C.
   $2 : \sqrt{3}$
4. D.
   $\sqrt{3} : 2$

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1. A.
   25 : 64
2. B.
   16 : 25
3. C.
   9 : 16
4. D.
   5 : 9

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