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Which of the following expression represents total
P volume of atoms present in a FCC unit cell of a

W metal? ( \( \mathrm{r} \) is the atomic radius)
(1) \( \frac{20}{3} \pi r^{3} \)
(2) \( \frac{24}{3} \pi r^{3} \)
(3) \( \frac{12}{3} \pi r^{3} \)
(4) \( \frac{16}{3} \pi r^{3} \)
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