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if yous answer is options 1,3,4 then you have to fill the Answer as ‘134’
If your answer is options 2, 4 then you have to fill the answer as '24'
If a circular concentric hole is made on a disc then about an axis passing through the centre of the disc and perpendicular to its plane
1) Moment of inertia decreases
2) Moment of inertia increases
3) Radius of gyration increases
4) Radius of gyration decreases

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answer is 13.

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