The radii of two planets are respectively R1 and R2 and their densities are respectively ρ1 and ρ2 . The ratio of the accelerations due to gravity at their surfaces is

Options :

1. g1:g2 = ρ1/R₁²: ρ2/R₂²

2. g1:g2 = R₁R₂: ρ1ρ2

3. g1:g2 = R₁ρ2: /R₂ρ1

4. g1:g2 = R₁ρ1: /R₂ρ2