If ∑n=0∞rn=5\sum_{n=0}^{\infty} r^n = 5∑n=0∞rn=5, what is ∑n=0∞r2n\sum_{n=0}^{\infty} r^{2n}∑n=0∞r2n?
25/925/925/9
5/25/25/2
125/24125/24125/24
13/513/513/5