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The radii of two planets ‘A’ and ‘B’ are ‘R’ and ‘4R’ an d their densities are ρ and ρ/3 respectively. The ratio of acceleration due to gravity at their surfaces (g A : g B ) will be :

1. 4 : 3
2. 1 : 16
3. 3 : 16
4. 3 : 4

Correct answer: 3 : 4

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