The ratio of the radii of two planets are respectively as 1 ∶ 4 and the ratio of their densities are respectively 1 ∶ 2. The find the ratio of the accelerations due to gravity at their surfaces is –

1
1 ∶ 8
2
1 ∶ 4
3
4 ∶ 1
4
8 ∶ 1

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