Find the interval of convergence for ∑n=1∞(−1)nxnn\sum_{n=1}^{\infty} \frac{(-1)^n x^n}{\sqrt{n}}∑n=1∞n(−1)nxn.
−1<x<1-1 < x < 1−1<x<1
−1≤x<1-1 \le x < 1−1≤x<1
−1<x≤1-1 < x \le 1−1<x≤1
−1≤x≤1-1 \le x \le 1−1≤x≤1