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JEE Mains · Maths · STD 11 - 8. sequence and series

माना \(f: R \rightarrow R\) इस प्रकार है कि सभी \(x \in R\) के लिए \(\left(2^{1+x}+2^{1-x}\right), f(x)\) तथा \(\left(3^{x}+3^{-x}\right)\) एक समांतर श्रेढ़ी में है, तो \(f( x )\) का न्यूनतम मान है 

  1. A \(0\)
  2. B \(3\)
  3. C \(2\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(3\)

Step-by-step Solution

Detailed explanation

\(f(x)=\frac{2\left(2^{x}+2^{-x}\right)+\left(3^{x}+3^{-x}\right)}{2} \geq 3\) \((A . M \geq G . M)\)
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