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a₂ = 8
a₃ = 4
a₂ = a₁q
a₃ = a₁q²
a₃/a₂ = g = 4/8 = 1/2
S₁₀ = [a₁(1 - q¹⁰)/(1 - q) = [16(1 - 1/2¹⁰)/(1 - 1/2) = [16(1 - 1/512)/1/2 =
= [16 * 511/512)/1/2 = 8176/512 : 1/2 = 8176/512 * 2 = 16352/512 = 31,9375