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Dik. barisan deret aritmatika :2, 8, 14, 20, ... Un
Dit. Rumus suku ke-n ?
Jawab....
beda (b) : U2-U1 = 8-2 = 6
Un = a + (n-1) b
Un = 2 + (n-1) (6)
Un = 2 + 6n -6
Un = 6n -4
Semoga membantu.. ^_^