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Masukan U30 ke rumus umum ke-n nya .
Un = 2n² + 50
Maka
U30 = 2(30)² + 50
U30 = 2.900 + 50
U30 = 1800 + 50
U30 = 1850
Jadi suku ke-30 adalah 1850.
= 2(900)+50
= 1.850