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U4 = a.r³
54 = 2. r³
r³ = 27
r = ∛27 = 3
Sn = a{(r^n) - 1} / (r - 1)
= 2{ 3^6) - 1} / (3 - 1)
= 2{ 729 - 1 ) / 2
= 728