A) \[R{{n}^{2/3}}\sigma \]
B) \[({{n}^{2/3}}-1)R\sigma \]
C) \[({{n}^{1/3}}-1)R\sigma \]
D) \[4\pi {{R}^{2}}({{n}^{1/3}}-1)\sigma \]
E) \[\frac{1}{{{n}^{1/3}}-1}\sigma R\]
Correct Answer: D
Solution :
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