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

\(\left(2 x+\frac{1}{x^7}+3 x^2\right)^5\) ના વિસ્તરણમાં અચળ પદ \(............\) છે.

  1. A \(1089\)
  2. B \(1080\)
  3. C \(1050\)
  4. D \(1562\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(1080\)

Step-by-step Solution

Detailed explanation

General term is \(\sum \frac{5 !(2 x)^{n_1}\left(x^{-7}\right)^{n_2}\left(3 x^2\right)^{n_3}}{n_{1} ! n_{2} ! n_{3} !}\) For constant term, \(n _1+2 n _3=7 n _2\) \(n _1+ n _2+ n _3=5\) Only possibility \(n _1=1, n _2=1, n _3=3\) \(\Rightarrow\) constant term \(=1080\)
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