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

माना \(\mathrm{f}(\mathrm{x})=\sum_{\mathrm{k}=1}^{10} \mathrm{kx}{ }^{\mathrm{k}}, \mathrm{x} \in \mathrm{R}\) है। यदि \(2 f(2)+\mathrm{f}^{\prime}(2)\) \(=119(2)^{\mathrm{n}}+1\) है, तो \(\mathrm{n}\) बराबर है___________.

  1. A \(9\)
  2. B \(10\)
  3. C \(8\)
  4. D \(7\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(10\)

Step-by-step Solution

Detailed explanation

\(f(x)=\sum \limits_{k=1}^{10} k x^k\) \(f(x)=x+2 x^2+\ldots \ldots \ldots+10 x^{10}\) \(f(x) . x=x^2+2 x^3+\ldots \ldots \ldots+9 x^{10}+10 x^{11}\) \(f(x)(1-x)=x+x^2+x^3+\ldots \ldots \ldots+x^{10}-10 x^{11}\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app