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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
3, 5, 9, 15, 23, ... → a = 3
2, 4, 6, 8, ... → b = 2
2, 2, 2, .... → c = 2
n = 40
Un = a + (n - 1) . b + 1/2 . (n - 1) . (n - 2) . c
U40 = 3 + 39 . 2 + 1/2 . 39 . 38 . 2
U40 = 3 + 78 + 1.482
U40 = 1.563