From a disc of radius R and mass M, a circular hole
of diameter R, whose rim passes through the centre
is cut. What is the moment of inertia of the
remaining part of the disc about a perpendicular
axis, passing through the centre ?
(1) 15 ``MR^2``/32
(2) 13 ``MR^2``/32
(3) 11 ``MR^2``/32
(4) 9 ``MR^2``/32