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

यदि \(\left(x+x^{\log _{2} x}\right)^{7}\) के प्रसार में चौथा पद \(4480\) है, तो \(x ( x \in N )\) का मान है

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

Answer & Solution

Correct Answer

(A) \(2\)

Step-by-step Solution

Detailed explanation

\({ }^{7} C _{3} x ^{4} x ^{\left(3 \log _{2}^{x}\right)}=4480\) \(\Rightarrow x ^{\left(4+3 \log _{2}^{x}\right)}=2^{7}\) \(\Rightarrow \quad(4+3 t ) t =7 ; t =\log _{2} x\) \(\Rightarrow t =1, \frac{-7}{3} \Rightarrow x =2\)
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