For a geometric series ∑n=0∞arn\sum_{n=0}^{\infty} ar^n∑n=0∞arn, which condition on rrr ensures convergence?
∣r∣<1|r| < 1∣r∣<1
∣r∣>1|r| > 1∣r∣>1
r=1r = 1r=1
r=−1r = -1r=−1