Total volume of atoms present in a face-centred cubic unit cell of a metal is ($r$ is atomic radius)
- A$\frac{12}{3} \pi r^3$
- B$\frac{16}{3} \pi r^3$
- C$\frac{20}{3} \pi r^3$
- D$\frac{24}{3} \pi r^3$
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