If ∑n=1∞an\sum_{n=1}^{\infty} a_n∑n=1∞an converges, what must be true about the sequence ana_nan?
limn→∞an=0\lim_{n \to \infty} a_n = 0limn→∞an=0
ana_nan is a decreasing sequence
∑an2\sum a_n^2∑an2 must converge
The sequence ana_nan must be positive