The sum of the series 1+3 x+6 x^ 2 +10 x^ 3 + is (where |x| < 1)

Mathematics · JEE Main · NTA Exams — Progression and Series

1. \(\frac{1}{(1-x)^{2}}\)
2. \(\frac{1}{1-x}\)
3. \(\frac{1}{(1+x)^{2}}\)
4. \(\frac{1}{(1-x)^{3}}\)

Answer

(D) 1 (1-x)^ 3

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