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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

यदि \(S\) उन सभी बिन्दुओं का समुच्चय है, जिनके लिए फलन, \(f( x )=|2-| x -3||, x \in R\) अवकलनीय नहीं है, तो \(\sum_{ x \in S } f(f( x ))\) बराबर है

  1. A \(5\)
  2. B \(2\)
  3. C \(3\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(3\)

Step-by-step Solution

Detailed explanation

\(f(x)=|2-| x-||3\) \(f\) is not differentiable at \(x=1,3,5\) \(\sum_{\mathrm{xes}} \mathrm{f}(\mathrm{f}(\mathrm{x}))=\) \( \mathrm{f}(\mathrm{f}(1))+\mathrm{f}(\mathrm{f}(3))+\mathrm{f}(\mathrm{f}(5)) \) \(=\mathrm{f}(0)+\mathrm{f}(2)+\mathrm{f}(0) \) \(=1+1+1=3 \)
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