1) A value of c for which conclusion of Mean Value Theorem holds for the function f (x) = logex on the interval [1, 3] is A) log3e B) loge3 C) 2log3e D) 12log3e Answer: Option CExplanation:Using Lagrange's Mean Value Theorem Let f(x) be a function defined on [a, b] then f'(c) = f(b)−f(a)b−a ...(1) cϵ[a,b] ∴Givenf(x)=logex ∴f(x)=1x equation (1) become 1c=f(3)−f(1)3−1 ⇒1c=loge3−loge12 = loge32 c = 2log3e