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Rumus suku ke-n dari barisan bilangan Un = 20n + 4 tentukan suku ke-5 suku ke-10 dan jumlah suku ke-5 dan 7!

Rani Maharani

Soal

Pembahasan

Un = 20n + 4

Kita bisa lakukan perhitungan seperti berikut:

$$U_5 = 20(5) + 4 = 100 + 4 = 104$$

$$U_{10} = 20(10) + 4 = 200 + 4 = 204$$

$$U_5 + U_7 = 20(5) + 4 + 20(7) + 4 = 100 + 4 + 140 + 4 = 248$$

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