For what values of rrr does ∑n=0∞rn\sum_{n=0}^{\infty} r^n∑n=0∞rn converge?
∣r∣<1|r| < 1∣r∣<1
r>1r > 1r>1
∣r∣≤1|r| \leq 1∣r∣≤1
r<−1r < -1r<−1