Let a₁, a₂, a₃, ..., aₙ, ... be a geometric sequence. Find S₁₀ and Sₙ. a₁ = 400, r = 0.8
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Step 1
Given that a₁ = 400 and a₂ = a₁ * r, we can find r by dividing a₂ by a₁. a₂ = 400 * r 400 * r = 400 * 0.8 r = 0.8 Show more…
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