A) \[\left( \frac{r}{\sqrt[3]{2}} \right)\]
B) \[\left( \frac{2r}{\sqrt{3}} \right)\]
C) \[\left( \frac{2r}{3} \right)\]
D) \[{{\left( \frac{r}{\sqrt{2}} \right)}^{2}}\]
Correct Answer: A
Solution :
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