The volume of a spherical shell having outer and inner radii as \( R \) and \( r \) is given...

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The volume of a spherical shell having outer and inner radii as \( R \) and \( r \) is given by
a. \( 4 \pi\left(\mathrm{R}^{3}-\mathrm{r}^{3}\right) \)
b. \( \pi\left(R^{5}-r^{5}\right) \)
- c. \( 2 \pi\left(\mathrm{R}^{2}-\mathrm{r}^{2}\right) \)
d. \( \frac{4}{3} \pi\left(\mathrm{R}^{3}-\mathrm{r}^{3}\right) \)
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