The radius of two cones are in the ratio of 2 ∶ 3, if their slant heights are in the ratio of 9 ∶ 8, then find the ratio of their curved surface area.

1
1 ∶ 1
2
1 ∶ 2
3
2 ∶ 1
4
3 ∶ 4
5
4 ∶ 3

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