In a face centered cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centers. One of the B atoms missing from one of the face in unit cell. The simplest formula of compounding is:

Explanation

Per Unit Cell,
No. of atoms of `A=6xx1/(8)=3/(4)` (Atoms of A are missing from two corners)
No. of atoms of `B=6xx1/(2)=3`
`therefore` Formula of Compound = `A_(3//4)B_(3)orAB_(4)`