question_answer

If the mean of \[\text{x}\]and \[\frac{1}{x}\] is M, then the mean of \[{{\text{x}}^{3}}and\,\,\frac{1}{{{x}^{3}}}\]

A)  \[\frac{M({{M}^{2}}-3)}{2}\]                     

B) \[N(4{{M}^{2}}-3)\]  

C) \[{{\text{M}}^{\text{3}}}\]                         

D)         \[{{\text{M}}^{\text{3}}}+\text{3}\]