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Total volume of atoms present in a face-centred cubic unit cell of a metal is ( \( \mathrm{r} \) is atomic radius)
(a) \( \frac{12}{3} \pi \mathrm{r}^{3} \)
(b) \( \frac{16}{3} \pi \mathrm{r}^{3} \)
(c) \( \frac{20}{3} \pi \mathrm{r}^{3} \)
(d) \( \frac{24}{3} \pi \mathrm{r}^{3} \)
\( \mathrm{P} \)
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