12 + 22x + 32x2 + 42x3 + ..... (x < 1)  ఆనంత శ్రేణి యొక్క మొత్తం _______.

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

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