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108 = 4 x r³
108 : 4 = r³
27 = r³
r = ∛27
r = 3
S5 = a ( - 1) / r - 1
S5 = 4 ( - 1) / 3-1
S5 = 4 ( 243 - 1) / 2
S5 = 4 x 242 / 2
S5 = 484