Actually, increase forms a geometric sequence: $ d_1 = 100 $, $ d_2 = 90 = 0.9 \times 100 $, $ d_3 = 81 = 0.9^2 \times 100 $, ..., $ d_k = 100 \times (0.9)^{k-1} $

Tue, 05 May 2026 23:29:37 +0000

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