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

\(\left(\frac{1- t ^{6}}{1- t }\right)^{3}\) के प्रसार में \(t ^{4}\) का गुणांक है

  1. A \(12\)
  2. B \(15\)
  3. C \(10\)
  4. D \(14\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(15\)

Step-by-step Solution

Detailed explanation

\(\left(1-t^{6}\right)^{3}(1-t)^{-3}\) \(\left(1-t^{18}-3 t^{6}+3 t^{12}\right)(1-t)^{-3}\) \(\Rightarrow\) coefficient of \(t^{4}\) in \((1-t)^{-3}\) is \(^{3+1-1} C_{4}=^{6} C_{2}=15\)
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