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JEE Mains · Maths · STD 11 - 7. binomial theoram

જો \({\left( {1 + {x^{{{\log }_2}\,x}}} \right)^5}\) ના વિસ્તરણમાં ત્રીજું પદ \(2560\) હોય તો \(x\) શક્ય કિમત મેળવો.

  1. A \(\frac{1}{4}\)
  2. B \(4\sqrt 2 \)
  3. C \(\frac{1}{8}\)
  4. D \(2\sqrt 2 \)
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Answer & Solution

Correct Answer

(A) \(\frac{1}{4}\)

Step-by-step Solution

Detailed explanation

In the expansion of \(\left(1+x^{\log _{2} x}\right)^{5}\) third term say \(\mathrm{T}_{3}=^{5} \mathrm{C}_{2}\left(\mathrm{x}^{\log _{2} \mathrm{x}}\right)^{2}=2560\) \(\Rightarrow\left(x^{\log x}\right)^{2}=256\) taking lograthium to the base \(2\) on both sides…
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