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JEE Mains · Maths · STD 12 - 7.2 definite integral

मान लीजिए कि [.] महत्तम पूर्णांक फलन को दर्शाता है। यदि \(\int_0^{e^3}\left[\frac{1}{\mathrm{e}^{\mathrm{x}-1}}\right] \mathrm{dx}=\alpha-\log _{\mathrm{e}} 2\) है, तो \(\alpha^3\) = ___

  1. A 2
  2. B 4
  3. C 6
  4. D 8
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Answer & Solution

Correct Answer

(D) 8

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\(f(x)=\frac{1}{e^{x-1}}=e^{1-x}\) \(\begin{array}{c|c}\mathrm{f}(\mathrm{x})=2 & \mathrm{f}(\mathrm{x})=1 \\\frac{1}{\mathrm{e}^{\mathrm{x}-1}}=2 & \mathrm{x}=1 \\\mathrm{x}=1-\ln 2 &\end{array}\) \(f(0)=e^1=2.71\) \(f\left(e^3\right)=e^{1-e^3} \in(0,1)\)…
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