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A right circular cone is sliced into a s...

A right circular cone is sliced into a smaller cone and a frustum of a cone by a plane perpendicular to its axis. The volume of the smaller cone and the frustum of the cone are in the ratio 64 : 61. Then their curved surface areas are in the ratio

A

`4:1`

B

`16:9`

C

`64:61`

D

`81:64`

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