What is the interval of convergence of the geometric series ∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn?
(−1,1)(-1, 1)(−1,1)
[−1,1)[-1, 1)[−1,1)
(−1,1](-1, 1](−1,1]
(−∞,∞)(-\infty, \infty)(−∞,∞)