Is octahedral and tetrahedral voids are only present in face centerd lattice

Q. In a fcc lattice, A, B, C and D atoms are arranged at corner, face center, octahedral void and tetrahedral void respectively, then the body diagonal contains :

Q. In closed packed lattice containing ${}^{\prime }{n}^{\prime }$ particles, the numbers of tetrahedral and octahedral voids are

Q. In a closed packed lattice containing n particles, the number of tetrahedral and octahedral voids respectively are :

Q. There are three ionic compounds, first compound has fcc lattice of anions and cations are present in all tetrahedral voids, second compound has fcc lattice of anions and cations are present in all octahedral voids and the third compound has simple cubical lattice in which cubical void is occupied by cation, then the order of packing efficiency of these will be :

Q. In a crystalline solid anion $B$ are arranged in a $ccp$ lattice. Cation $A$ are equally distributed between octahedral and tetrahedral voids. If all octahedral voids are occupied. What is the formula of the solid?