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ap^5 / ap^2 = p^3
p^3 = -96 / 12 = -8
p = - 2. --------> ap^2 = 12
4a = 12
a = 3
Sn = a(1 - p^n) / 1 - p
S8 = 3(1 - (-2)^8) / 1 - (-2)
S8 = - 255