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b = 500.000
Sn = n/2 (2a+(n-1)b)
S10 = 10/2 (2(3.000.000) + 9(500.000))
= 5 (6.000.000 + 4.500.000)
= 5 x 10.500.000
= 52.500.000
semoga membantu ya :)