Answer:
-2
Explanation:
Each term is multiplied by -2 to get the next term
All even members of the sequence are -
All odd members of the sequence are +
Ignore that for the moment and let's just find the ratio.
t_n/t_n-1 = - 2
t_2/t_n-1 = -18/9 = - 2
t_3/t_2 = 36/-18 = - 3
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