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Application of Derivatives question

2017 · Shift 1 · Q34
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  2. /JEE Advanced
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  4. /Application of Derivatives
  5. /2017 · Shift 1 · Q34

Application of Derivatives question

2017 · Shift 1 · Q34

JEE AdvancedMathematicsApplication of DerivativesMCQ+3 / −1
By approximately matching the information given in the three columns of the following table.

Let f(x) = x + loge x −-− x loge x, x ∈\in∈(0, ∞\infty∞)

Column 1 contains information about zeroes of f(x), f'(x) and f"(x).

Column 2 contains information about the limiting behaviour of f(x), f'(x) and f"(x) at infinity.

Column 3 contains information about increasing/decreasing nature of f(x) and f'(x).

Column - 1 Column - 2 Column - 3
(i) f(x) = 0 for some x∈(1,e2)x \in (1,{e^2})x∈(1,e2) (i) lim⁡x→∞ f(x)=0\mathop {\lim }\limits_{x \to \infty } \,f(x) = 0x→∞lim​f(x)=0 f is increasing in (0, 1)
(ii) f'(x) = 0 for some x∈(1,e)x \in (1,e)x∈(1,e) lim⁡x→∞ f(x)=−∞\mathop {\lim }\limits_{x \to \infty } \,f(x) = - \inftyx→∞lim​f(x)=−∞ f is decreasing in (e, e2{e^2}e2)
(iii) f'(x) = 0 for some x∈(0,1)x \in (0,1)x∈(0,1) lim⁡x→∞ f′(x)=−∞\mathop {\lim }\limits_{x \to \infty } \,f'(x) = - \inftyx→∞lim​f′(x)=−∞ f' is increasing in (0, 1)
(iv) f'(x) = 0 for some x∈(1,e)x \in (1,e)x∈(1,e) lim⁡x→∞ f′(x)=0\mathop {\lim }\limits_{x \to \infty } \,f'(x) = 0x→∞lim​f′(x)=0 f' is decreasing in (e, e2{e^2}e2)
Which of the following options is the only INCORRECT combination?
  1. A
    (I) (iii) (P)
  2. B
    (II) (iv) (Q)
  3. C
    (II) (ii) (P)
  4. D
    (III) (i) (R)
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