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5. Continuity and Differentiation
medium
A value of $c$ for which the conclusion of mean value the theorem holds for the function $f(x) = log{_e}x$ on the interval $[1, 3]$ is
A
$log_e\ 3$
B
$log_3\ e$
C
$2\ log_3\ e$
D
$\frac{1}{2}{\log _e}\,3$
Solution
$f^{\prime}(x)=\frac{f(3)-f(1)}{3-1}$
$\frac{1}{x}=\frac{\ln 3-0}{2}$
$x=\frac{2}{\ln 3}=2 \log _{3} e$
Standard 12
Mathematics