Class 11MathematicsSequences and Seriesnth term of special series, Sum to n terms and Infinite number of terms
MediumThe sum of the series $1 + 3x + 6x^2 + 10x^3 + \dots \infty$ is
- A$\frac{1}{(1 - x)^2}$
- B$\frac{1}{1 - x}$
- C$\frac{1}{(1 + x)^2}$
- D$\frac{1}{(1 - x)^3}$
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The sum of the first $n$ terms of the series $\frac{3}{5}+\frac{21}{25}+\frac{117}{125}+\ldots$ is
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