If limn→∞∣an+1an∣=0.5\lim_{n \to \infty} |\frac{a_{n+1}}{a_n}| = 0.5limn→∞∣anan+1∣=0.5, the series ∑an\sum a_n∑an:
Converges
Diverges
Is inconclusive
Converges to 0.5