Two discs of same mass, radii r1 and r2, thickness 1 mm and 0.5 mm have densities in the ratio 3 : 1.

Two discs of same mass, radii r₁ and r₂, thickness 1 mm and 0.5 mm have densities in the ratio 3 : 1. The ratio of their moment of inertia about diameter is 1 : x. Find x.

Two discs of same mass, radii r1 and r2, thickness 1 mm and 0.5 mm have densities in the ratio 3 : 1.

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