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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना \(f: R \rightarrow R\) एक फलन है जो: \(f(x)=\left\{\begin{array}{l}\max \left\{t^3-3 t\right\} ; x \leq 2 \\ t \leq x \\ x^2+2 x-6 ; 2<x<3 \\ {[x-3]+9 ; 3 \leq x \leq 5} \\ 2 x+1 \quad ; \quad x>5\end{array}\right\}\) द्वारा परिभाषित है जहाँ \([t], t\) से कम या बराबर महत्तम पूर्णाक है। माना \(m\) उन बिन्दुओं की संख्या है जहाँ \(f\) अवकलनीय नहीं है तथा \(I =\int \limits_{-2}^2 f( x ) dx\) है। तब क्रमित युग्म \(( m , I )\) है :

  1. A \(\left(3, \frac{27}{4}\right)\)
  2. B \(\left(3, \frac{23}{4}\right)\)
  3. C \(\left(4, \frac{27}{4}\right)\)
  4. D \(\left(4, \frac{23}{4}\right)\)
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Answer & Solution

Correct Answer

(C) \(\left(4, \frac{27}{4}\right)\)

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Detailed explanation

\(\left\{\begin{array}{l} f ( x )= x ^{3}-3 x , x \leq-1 \\ 2,-1< x <2 \\ x ^{2}+2 x -6,2< x <3 \\ 9,3 \leq x <4 \\ 10,4 \leq x <5 \\ 11, x =5 \\ 2 x +1, x >5\end{array}\right.\) Clearly \(f ( x )\) is not differentiable at \(x =2,3,4,5 \Rightarrow m =4\)…
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