The co-efficient of x 4 in the expansion of (1 + x + x 2 + x 3 ) n is
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
The co-efficient of x4 in the expansion of (1 + x + x2 + x3)n is
- nC4
- nC4 + nC2
- nC4 + nC1 + nC4 . nC2
- nC4 + nC2 + nC1 . nC2
Answer
(D) n C 4 + n C 2 + n C 1 . n C 2
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