Which answers are geometric sequences? There is more than one correct answer. Select all that apply.

{108, 36, 12, 4, ...}

{2.5, 4, 5.5, 7,...}

{-13, -6, 1,8,...}

{2, -10,50,- 250,...}

{1,-1,1,-1,1,... }

{0,10,20,30,...}