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Verified answer
S5 = 1.500.000b = 50.000
sn = n/2 x ( 2a + b(n-1))
1.500.000 x 2 = 5(2a + 4x50.000)
2a + 200.000 = 3.000.000/5 = 600.000
2a = 400.000
a = 400.000/2 = 200.000
anak pertama = u5 = 200.000 + 4x50.000 = 400.000