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Un = 2 + (n-1)4
Un = 2 + 4n - 4
Maka, rumus suku ke-n (Un) = 4n - 2
b. Un = a + (n-1)b + 1/2(n - 1) (n - 2) c
Un = 4 + (n-1)4 + 1/2(n-1) (n-2)2
Un = 4 + 4n - 4 + n² - 3n + 2
Maka, rumus suku ke-n (Un) = n² + n + 2
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