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JEE Mains · Maths · STD 12 - 1. relation and function

\(\mathrm{f}(\mathrm{n})+\frac{1}{\mathrm{n}} \mathrm{f}(\mathrm{n}+1)=1, \forall \mathrm{n} \in\{1,2,3\}\) को संतुष्ट करने वाले फलनों \(\mathrm{f}:\{1,2,3,4\} \rightarrow\{\mathrm{a} \in \mathbb{Z}|\mathrm{a}| \leq 8\}\) की संख्या है -

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

Correct Answer

(D) \(2\)

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Detailed explanation

\(f:\{1,2,3,4\} \rightarrow\{ a \in Z :| a | \leq 8\}\) \(f( n )+\frac{1}{ n } f ( n +1)=1, \forall n \in\{1,2,3\}\) \(f( n +1)\) must be divisible by \(n\) \(f(4) \Rightarrow-6,-3,0,3,6\) \(f(3) \Rightarrow-8,-6,-4,-2,0,2,4,6,8\)…
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