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

\(\left(x^4-\frac{1}{x^3}\right)^{15}\) के प्रसार में \(x^{18}\) का गुणांक है

  1. A \(5004\)
  2. B \(5003\)
  3. C \(5002\)
  4. D \(5005\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(5005\)

Step-by-step Solution

Detailed explanation

\(\left(x^4-\frac{1}{x^3}\right)^{15}\) \(T_{r+1}={ }^{15} C_r\left(x^4\right)^{15-r}\left(\frac{-1}{x^3}\right)^r\) \(60-7 r=18\) \(r=6\) Hence coeff. of \(x^{18}={ }^{15} C _6=5005\)
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