If three elements X, Y and Z crystallize in a cubic solid with X atoms at the corners, Y atoms at the cube centres and Z atoms at the face of the cube, then write the formula of the compound.

Explanation

To find the formula of the compound formed by the elements X, Y, and Z in a cubic solid, we need to determine the contribution of each type of atom based on their positions in the unit cell.

### Step-by-Step Solution:

1. **Identify the Positions of Atoms:**
- X atoms are located at the corners of the cube.
- Y atoms are located at the center of the cube.
- Z atoms are located at the faces of the cube.
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