The volume occupied by the atoms in a unit cell of hexagonal close packing $(HCP)$ or cubic close packing $(CCP)$ is equal to:
- A$\frac{20\pi r^3}{3}$
- B$\frac{24\pi r^3}{3}$
- C$\frac{12\pi r^3}{3}$
- D$\frac{16\pi r^3}{3}$
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