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b = 6
Un = a + (n-1) b
Un = 16 + (n -1) 6
Un = 16 + 6n -6
Un = 10 + 6n
U₁₂ = 10 + 6. 12
U₁₂ = 10 + 72
U₁₂ = 82
jadi, suku ke 12 deret tersebut adalah 82