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Let the moment of inertia of a hollow cylinder of length 30 cm (inner radius 10 cm and outer radius 20 cm), about its axis be $I$. The radius of a thin cylinder of the same mass such that its moment of inertia about its axis is also $I$, is:
(1) 12 cm
(2) 16 cm
(3) 14 cm
(4) 18 cm
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