Which function is represented by the geometric series ∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn for ∣x∣<1|x| < 1∣x∣<1?
1−x1-x1−x
11−x\frac{1}{1-x}1−x1
11+x\frac{1}{1+x}1+x1
exe^xex