Given ∑n=0∞rn=3\sum_{n=0}^{\infty} r^n = 3∑n=0∞rn=3. What is ∑n=0∞r2n\sum_{n=0}^{\infty} r^{2n}∑n=0∞r2n?
1.81.81.8
1.21.21.2
1.51.51.5
2.252.252.25