b₃ = 18 q = 3
b₃ = b₁ * q²
b₁ = b₃ : q² = 18 : 3² = 18 : 9 = 2
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b₃ = 18 q = 3
b₃ = b₁ * q²
b₁ = b₃ : q² = 18 : 3² = 18 : 9 = 2