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Three rings each of mass m and radius r ...

Three rings each of mass m and radius r are so placed that they touch each other. The radius of gyration of the system about the axis as shown in the figure is

A

`3MR^(2)`

B

`3.5 MR^(2)`

C

`2.5 MR^(2)`

D

`2 MR^(2)`

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