2. the difference in number of faces in forms hk 1) and {11) in the holosymmetric class of the isometric system is (a) 40 (b) 43 (c) 48 (d) 20

I think there's a mistake in the question. In place of {hk1} it should be {hkl}. {hkl} is the general symbol of hexoctahedron. and number of faces in hexoctahedron is equal to = ...