let A = {x ∈ \(\mathbb R\)\(3^x\left(\sum_{r=1}^{\infty}\frac{3}{10^r}\right)^{x-2}<3^{-4x}\)} then A = 

1
(-1, ∞)
2
(-1/2, ∞)
3
(0, 1)
4
(1, ∞)

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