Two spheres each of mass M and radius R/...

Two spheres each of mass M and radius `R//2` are connected with a massless rod of lenth 2R as shown in fig.What will be the oment of inertia of the system about an axis passing through the centre of one of the spheres and prependicular to the rod?

`21/5 MR^2`

`2/5 MR^2`

`5/2 MR^2`

`5/(21) MR^2`.

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