The number of oxygen atoms per unit cell in CCP = 4(O−2) The number of octahedral voids per unit cell = 4(Al+3) The number of tetrahedral voids per unit cell = 8(Mg+2) Overall magnitude of negative charge due to oxygen atoms = 8 Overall, the unit cell isneutral, hence: m4(3) + 2n(8)+ 4(-2) = 0 3m + 4n = 2 In the above equation, substitute the values of the given options. (A)