If | x |<1 , then the coefficient of x ^ in expansion of (1+ x + x ^ 2 + x ^ 3 + )^ 2 is

Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications

1. \(\text { n }\)
2. \(\text { n - } 1\)
3. \(n+2\)
4. \(n+1\)

Answer

(D) n+1

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