A) \[\frac{61\pi }{3}\]
B) \[\frac{122\pi }{3}\]
C) \[\frac{244\pi }{3}\]
D) \[\frac{250\pi }{3}\]
Correct Answer: C
Solution :
\[{{r}_{i}}=\frac{8}{2}=4\,cm\,\,\Rightarrow \,{{r}_{o}}=\frac{10}{2}=5\,cm\] Required volume \[=\frac{4}{3}\pi r_{o}^{3}-\frac{4}{3}\pi r_{i}^{3}\] \[=\frac{4}{3}\pi [{{5}^{3}}-{{4}^{3}}]=\frac{4\pi }{3}\times 61=\]
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