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= 6/2 ( 2(400.000) + 5(-50.000)
= 3 (800.000 - 250.000)
= 3 (550.000)
= 1.650.000
b = -50.000
Sn = n/2(2a+(n-1)b)
S6 = 6/2(2×400.000+(6-1)(-50.000))
S6 = 3(800.000-250.000)
S6 = 3(550.000)
S6 = Rp1.650.000,00