Consider the series ∑n=1∞x2n\sum_{n=1}^{\infty} x^{2n}∑n=1∞x2n. For what values of xxx does it converge?
−1<x<1-1 < x < 1−1<x<1
0<x<10 < x < 10<x<1
x<1x < 1x<1
∣x∣>1|x| > 1∣x∣>1