Given ∑n=0∞rn=4\sum_{n=0}^{\infty} r^n = 4∑n=0∞rn=4, what is ∑n=0∞rn⋅(−1)n\sum_{n=0}^{\infty} r^n \cdot (-1)^n∑n=0∞rn⋅(−1)n?
4/34/34/3
3/43/43/4
2/32/32/3
4/74/74/7