If mass of the earth decreases by 25% and its radius increases by 50% then acceleration due to gravity at the surface
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General relation between acceleration and radius is
a = GM/r^2
Generally in earth
g=GM/r^2 where r is the radius of earth and m is the mass of earth.
In your case, obviously the g will be different.
g(new)=(G*0.75M) / (1.5r)^2 = GM/3r^2
g(new)=g/3
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