Which of the following represents a geometric sequence?
I 1/4, 1/4, 1/4, 1/4, ......
II 1/4, 1/5, 1/6, 1/7, ......
III 1/4, 1, -4, 16, .....
IV 1/4, -4, 1/4, -4, .....
***ITS A****
