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