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Materi : Barisan & Deret bilangandiketahui barisan bil. 12, 20, 30, 42, 56, ...
dit U22 = ?
12, 20, 30, 42, 56,
8 10 12 14
2 2 2
maka
a = 12
b = 8
c = 2
Un = a + b(n - 1) + c(n - 1)(n - 2) / 2
Un = 12 + 8n - 8 + n² - 3n + 2
Un = n² - 3n + 6
U22 = 22² - 3(22) + 6
U22 = 424