For each sequence, determine if the sequence is a geometric sequence. If so, identify the common ratio.

1. \(\{5,20,80,320,1,280,5,120,20,480, \ldots\}\)

2. \(\{-3,6,-12,24,11,33\}\)

3. \(\left\{4,2,1, \frac{1}{2}, \frac{1}{4}, \frac{1}{8}, \ldots\right\}\)