For the Mean Value Theorem $f(b) - f(a) = (b - a) f'(x_1)$ where $a < x_1 < b$,if $f(x) = 1/x$,then $x_1 = ?$

  • A
    $\sqrt{ab}$
  • B
    $\frac{2ab}{a + b}$
  • C
    $\frac{a + b}{2}$
  • D
    $\frac{b - a}{b + a}$

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If $f(x) = \begin{cases} x, & 0 \leq x \leq 1 \\ 2-x, & 1 < x \leq 2 \end{cases}$, then Rolle's theorem is not applicable to $f(x)$ because

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