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b = 18000
S12 = n/2 . (2a + (n - 1) . b)
S12 = 12/2 . (2 . 46000 + (12 - 1) . 18000)
S12 = 6 . (92000 + 11 . 18000)
S12 = 6 . (92000 + 198000)
S12 = 6 . 290000
S12 = 1740000