1.

The least positive integral value of the expression `(1)/(2) log_(10) m - log_(m^(-2)) 10` is ______.

Answer» Correct Answer - B
(i) The least positive integral value of `x + (1)/(x) = 2`
(ii) Let `log_(m) 10 = x` then `log_(m) 10 = (1)/(x)`.
(iii) The given expression becomes `(1)/(2) (x + (1)/(x))`
(iv) Now the least positive value is obtained if `x + (1)/(x)` is minimum.


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