If [1+2 x+3 x^ 2 ]^ 10 =a_ n +a_ 1 x+a_ 2 x^ 2 + +a_ 2 n x^ 2 n , then l _ 1 equals
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
If \(\left[1+2 x+3 x^{2}\right]^{10}=a_{n}+a_{1} x+a_{2} x^{2}+\ldots+a_{2 n} x^{2 n}\), then \(\mathrm{l}_{1}\) equals
- 10
- 20
- 210
- None of these
Answer
(C) 210
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