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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
4, 5, 8, 13, ... → a = 4
...1...3....5... → b = 1
.....2...2.. → c = 2
n = 39
Un = a + (n - 1) . b + 1/2 . (n - 1) . (n - 2) . c
U39 = 4 + 38 . 1 + 1/2 . 38 . 37 . 2
U39 = 4 + 38 + 1.406
U39 = 1.448