Which series represents f(x)=11−x2f(x) = \frac{1}{1-x^2}f(x)=1−x21 for ∣x∣<1|x| < 1∣x∣<1?
∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn
∑n=0∞x2n\sum_{n=0}^{\infty} x^{2n}∑n=0∞x2n
∑n=0∞(x2)n\sum_{n=0}^{\infty} (x^2)^n∑n=0∞(x2)n
Both b and c