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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
12, 20, 30, 42, 56, ... → a = 12
8, 10, 12, 14, .... → b = 8
2, 2, 2, ..... → c = 2
n = 15
Un = a + (n - 1) . b + 1/2 . (n - 1) . (n - 2) . c
U15 = 12 + 14 . 8 + 1/2 . 14 . 13 . 2
U15 = 12 + 112 + 182
U15 = 306