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A solid sphere of mass $M$ and radius $R$ is divided into two unequal parts. The first part has a mass of $\frac{7M}{8}$ and is converted into a uniform disc of radius 2R. The second part is converted into a uniform solid sphere. Let $I_1$ be the moment of inertia of the new sphere about its axis. The ratio $I_1/I_2$ is given by:
(1) 185
(2) 140
(3) 285
(4) 65
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