અનંત શ્રેણીનો સરવાળો 1 2 + 2 2 x + 3 2 x 2 + 4 2 x 3 + ..... (x < 1) _______ છે.

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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