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Question

A right circular cone is cut by a plane parallel to its base in such a way that the slant heights of the original and the smaller cone thus obtained are in the ratio 2:1. If V1 and V2 are respectively the volumes of the original cone and of the new cone, then what is V1:V2?

A
2:1
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B
3:1
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C
4:1
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D
8:1
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