For the series ∑n=0∞(1/3n)xn\sum_{n=0}^{\infty} \binom{1/3}{n} x^n∑n=0∞(n1/3)xn, what is the interval of convergence?
[−1,1][-1, 1][−1,1]
(−1,1)(-1, 1)(−1,1)
[−1,1)[-1, 1)[−1,1)
(−1,1](-1, 1](−1,1]