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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना \(I _{ n }=\int \limits_{1}^{ e } x ^{19}(\log | x |)^{ n } dx\) है, जहाँ \(n \in N\) है । यदि घन पूर्णांकों \(\alpha\) तथा \(\beta\) के लिए \((20) I _{10}=\alpha I _{9}+\beta I _{8}\) है, तो \(\alpha-\beta\) बराबर है ......... |

  1. A \(2\)
  2. B \(1\)
  3. C \(3\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(B) \(1\)

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Detailed explanation

\(I _{ n }=\int_{1}^{ e } x ^{19}(\log | x |)^{ n } d x\) \(I _{ n }=\left|(\log | x |)^{19} \frac{ x ^{20}}{20}\right|_{1}^{e}-\int n (\log | x |)^{ n -1} \cdot \frac{1}{ x } \cdot \frac{ x ^{20}}{20} dx\) \(20 I _{ n }= e ^{20}- nI _{ n -1}\)…
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