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

\(x\) की घातों में \(\left(1+x+x^{2}+x^{3}\right)^{6}\) के प्रसार में \(x^{4}\) का गुणांक है .............

  1. A \(116\)
  2. B \(118\)
  3. C \(120\)
  4. D \(124\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(120\)

Step-by-step Solution

Detailed explanation

\(\left(1+x+x^{2}+x^{3}\right)^{6}=\left((1+x)\left(1+x^{2}\right)\right)^{6}\) \(=(1+x)^{6}\left(1+x^{2}\right)^{6}\) \(=\sum_{ r =0}^{6}{ }^{6} C _{ r } x ^{ r } \sum_{ r =0}^{6}{ }^{6} C _{ t } x ^{2 t }\)…
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