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

यदि \(\left( x ^{2}+\frac{1}{ bx }\right)^{11}, b \neq 0\), में \(x ^{7}\) का गुणांक तथा \(\left( x -\frac{1}{ bx ^{2}}\right)^{11}\), में \(x ^{-7}\) का गुणांक बराबर है, तो \(b\) का मान बराबर है ?

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

Answer & Solution

Correct Answer

(D) \(1\)

Step-by-step Solution

Detailed explanation

Coefficient of \(x^{7} \operatorname{in}\left(x^{2}+\frac{1}{b x}\right)^{11}\) \({ }^{11} \mathrm{C}_{\mathrm{r}}\left(\mathrm{x}^{2}\right)^{11-\mathrm{r}} \cdot\left(\frac{1}{\mathrm{bx}}\right)^{\mathrm{r}}\)…
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