question_answer

If the mean of x and\[\frac{1}{x}\] is M, then the mean of \[{{x}^{2}}\,\,and\,\,\frac{1}{{{x}^{2}}}\]

A)  \[{{M}^{2}}\]                                   

B)  \[\frac{{{M}^{2}}}{4}\]

C)  \[2{{M}^{2}}-1\]               

D)         \[2{{M}^{2}}+1\]