Let ana_nan be a geometric sequence such that ∑n=1∞an=4\sum_{n=1}^{\infty} a_n = 4∑n=1∞an=4 and ∑n=1∞an2=16/3\sum_{n=1}^{\infty} a_n^2 = 16/3∑n=1∞an2=16/3. What is the common ratio rrr?
1/21/21/2
1/31/31/3
2/32/32/3
1/41/41/4