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

वह न्यूनतम प्राकृत संख्या \(n\), जिसके लिए \(\left( x ^{2}+\frac{1}{ x ^{3}}\right)^{ n }\) के प्रसार में \(x\) का गुणांक \({ }^{ n } C _{23}\) है

  1. A \(38\)
  2. B \(58\)
  3. C \(23\)
  4. D \(35\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(38\)

Step-by-step Solution

Detailed explanation

\({T_{r + 1}}\, = \,\sum\limits_{r = 0}^n {^n{C_r}\,{x^{2n - 2r}}\,.\,{x^{ - 3r}}} \) \(2n - 5r = 1\Rightarrow 2n = 5r + 1\) for \(r = 15, n = 38\) smallest value of \(n\) is \(38\).
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