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18 = ar... a = 18/r
U4 = ar³
162 = ar³.... a = 162/r³
a = a
18/r = 162/r³
18r³ = 162r
r² = 162/18
r² = 9
r = √9
r = 3
a = 18/r
a = 18/3
a= 6