Seven identical circular planar disks, each of mass \( M \) and radius \( R \) are welded symmet...

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Seven identical circular planar disks, each of mass \( M \) and radius \( R \) are welded symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point \( P \) is
(1) \( \frac{181}{2} M R^{2} \)
(2) \( \frac{19}{2} M R^{2} \)
(3) \( \frac{55}{2} M R^{2} \)
(4) \( \frac{73}{2} M R^{2} \)
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