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U3 = 18
a.r^2 = 18
2.r^2 = 18
r^2 = 18:2
r = √9
r = 3
S6 = a.(r^n - 1)/(r-1)
S6 = 2.(3^6 - 1)/(3-1)
S6 = 2.(729-1)/2
S6 = 728