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Verified answer
Barisan Aritmetika Bertingkat Dua.Un = a / 0! + b(n - 1) / 1! + c(n - 1)(n - 2) / 2!
U₁₄ = 30 / 0! + 12(14 - 1) / 1! + 2(30 - 1)(30 - 2) / 2!
= 30 + 156 + 812
= 998